mass of green acicular to bladed crystals associated with chlorite
aggregate of green acicular crystals associated with chlorite
green acicular crystals forming parallel groups in cylindrical or bladed forms
green prismatic crystals in a radial arrangement
pale yellow spherical aggregate of bladed crystals
dull white to cream to yellowish surface. data from kampf et al (2011)
dark blue coarsely crystalline massive associated with green diopside
colorless to white short prismatic crystals
colorless fragment of a tabular single crystal
colorless to brown prismatic single crystals
colorless tabular single crystals associated with fluorapatite r050401
dark red well-formed dodecahedral crystals in schist
purple transparent hexagonal prisms, polytype 2h2
white trapezohedra associated with black arfvedsonite, r040127
clear colorless single crystals associated with gmelinite
white trapezohedral crystal associated with levyne-na, r060021
reddish-brown colored druse of crystals associated with white svabite r050180
cluster of black vitreous crystals showing well-developed faces
colorless transparent elongated prismatic crystal
black prismatic crystal associated with white analcime, r040128
pale brown to colourless, transparent crystals of dipyramidally terminated. associated with xenotime-( y), calcioancylite-(nd) and la-dominant calcioancylite. data from malcherek et al (2012)
black to dark green tabular euhedral crystal
euhedral, short prismatic, black crystals in vesicular basalt.
very dark grey-green prismatic crystals frozen in quartz
brown colored axe-head-shaped single crystals
light-pink transparent axe-head-shaped single crystal
brown transparent wedge-shaped single crystal
light blue hexagonal prism, variety aquamarine
light blue colored tabular single crystal
green hexagonal prisms in a muscovite schist, variety emerald. note that there are micro inclusions of actinolite. the raman signal is a mixture of the two phases.
colorless hexagonal tabular crystals, type sample
dark blue colored interpenetrating cubes
pair of greenish yellow elongated crystals
black fragment of a prismatic crystal associated with quartz
yellowish-brown to reddish-brown thin tabular crystal
steel gray octahedral crystals that have a tarnished exterior
steel-gray octahedral crystal associated with calcite
dark brown short prismatic single crystals
black crystals associated with colorless quartz and grey stannite.
tan colored pseudohexagonal tabular crystals
colorless transparent thin tabular pseudohexagonal crystal
reticulated composite of colorless tabular crystals
light tan colored rhombohedral single crystals
group of brass yellow metallic tetrahedra, dark streaks represent alteration by bacteria where s is left behind
dark greenish-black foliated cleavage fragments
fine-grained aggregates coexisting with hercynite, gehlenite, and perovskite. data from ma et al (2011)
deep red single crystals embedded in matrix
crystals translucent to transparent, colourless to white,with a white streak and a vitreous lustre. associated with marcasite, gypsum, and hydrated fe oxides. data from vignola et al (2012)
colorless grains associated with stishovite
orange-brown blebs embedded in calcite matrix
group of colorless platy prismatic crystals
divergent aggregate of red thin prismatic crystals
greenish-brown fragment of a prismatic crystal
steel gray fragment with internal red hints
iridescent blue metallic hexagonal plates
irridescent blue to purple hexagonal plates
blue iridescent metallic hexagonal plates
aggregates of subparallel to slightly diverging prisms lying partly on and partly embedded in ne-grained calcioandyrobertsite. type sample. data from hawthorne et al. (2012)
green square prismatic crystal associated with pale orange calcite
brown cleavage fragment with white hardystonite
yellowish-brown tabular crystals associated with vesuvianite, r060170
black prismatic crystals associated with orange calcite
bluish green coarsely crystallized fragment
aggregate of colorless to white rhombohedra
aggregate of pale pink curved saddle-shaped crystals
colorless bladed crystals associated with pyrrhotite and albite
dark brown euhedral prismatic single crystal
transparent pale green water worn fragment
pink crystal associated with trilithionite, r060004
dark green massive, associated with anthophyllite
brown, translucent, vitreous crystal fragment
colorless platy crystals forming a pseudohexagonal aggregate
green prismatic crystals imbedded in quartz
cluster of green elongated prismatic crystals
radiating group of colorless acicular hexagonal prisms
black single crystal fragment with internal hints of red and green
dark brown rectangular prismatic crystals
aggregate of blue crystal fragments separated by veins of quartz
pale purple hexagonal prism associated with albite r050402
green colored fragment of a hexagonal prism
colorless fragment associated with red villiaumite
greenish-white prismatic single crystal associated with scolecite
green fragments from xenoliths in a basalt flow
colorless crystal fragments obtained from a boule.
dark green crystal fragments from xenoliths in a basalt flow
dark blue octahedral single crystals embedded in quartz matrix
thin veins cutting calcio-olivine skarn (image). colourless, white, pale grey. associated with pavlovskyite. data from lazic et al (2011)
colorless to pink crystals lining a basalt vug
salmon-red interpenetrating prismatic rhombohedral crystals
radiating spray of black to brown platy crystals
colorless single crystal in rhyolite matrix
brown bladed crystals in parallel aggregate
radial aggregate of green thin bladed crystals
colorless thin tabular crystals in a sheaflike aggregate
pale pink coffin-shaped tabular single crystals
black tabular crystals associated with quartz
orange to golden orange crystals in efflorescent crusts. data from rakovan et al (2011)
granular aggregate of reddish-orange crystals
group of colorless indistinct rounded crystals
colourless to very pale tan flakes, associated with natrolite, barytolamprophyllite, nechelyustovite, hydroxylapatite, belovite-(la), belovite-(ce), gaidonnayite, nenadkevichite, epididymite, apophyllite-(kf) and sphalerite. data from camara et al (2012)
aggregate of parallel pink colored acicular crystals
pale gray long prism coated with smaller crystals
brown fragment showing lamellar habit. type sample
azure-blue stubby crystals with complex terminations
hydrothermal synthesis. crystals grow in a teflon lined parr autoclave at 220 c during 48 h.
yellow crystal fragments; same material used in mclean et al. (1971) study
pale lavendar cut gemstone, 0.65 cts, formerly known as musgravite-18r
aggregate of white radiating thin acicular crystals.
clear to white elongated prismatic single crystal
white cleavage fragment with some perthitic character
white to colorless heterogeneous mixture of k and na feldspar in a cluster of crystals. crystal structure determined, presented below. this sample is known as an intermediate microcline in the literature.
yellow hexagonal prisms, monoclinic polytype
yellow to brownish hexagonal prism, monoclinic polytype
black pseudohexagonal crystal, polytype 2m1, associated with quartz
greenish blue prismatic, untwinned. structure for this sample reported in li et al (2008).
single crystal, reddish-brown to orangish prism section, several prism forms, small transparent areas.
colorless short prismatic crystals in subparallel groups
prismatic crystals. data from lazic et al (2012)
colorless to gray columnar blocky crystals
colorless to pale blue and transparent.  data from kampf et al (2009)
brass yellow modified cubes with typical pyrite striations
yellowish green prismatic hexagonal single crystals
light green hexagonal prismatic hoppered single crystals
pale pink group of single crystals, variety rose quartz
pink crystal associated with colorless quartz
an aggregate of white to colorless pearly anhedral plates
pale pink prismatic crystals in parallel or near parallel aggregates
colorless acicular single crystals associated with fluorapophyllite
orange tabular single crystal associated with aegirine and microcline
group of tan colored flattened rhombohedra
euhedral lath-shaped crystals included in association with buseckite. data from ma et al (american mineralogist, 97 (2012) 1226-1233)
blue grains in a coarsely crystalline rock
pale pink fragment of a single crystal, variety kunzite
parallel aggregates of thin tabular brown crystals
globular aggregate of thin tabular white single crystals
light blue platy subhedral-to-anhedral crystals. associated with quartz, muscovite, beryl, hurlbutite, hydroxylherderite, apatite-group minerals,  and phenakite. data from rao et al (2014)
an aggregate of colorless foliated coarse single crystals
radial groups of colorless bladed crystals
aggregate of colorless subhedral crystals
green flattened wedge-shaped single crystals
group of colorless acicular single crystals
aggregate of purple hexagonal plates, polytype is 2m1
pink massive with defined cleavage planes
radial aggregates of yellowish-orange, transparent bladed crystals. associated with pyrite and iron oxyhydroxides. data from biagioni et al (2011)
tan colored tapered hexagonal single crystals
colorless blocky modified rhombic crystals
tan colored prismatic group of columnar crystals
tan colored fragments of single crystals
purple platy crystals embedded in drill core
dark gray metallic twisted and distorted fibers in a radiating aggregate, co-type sample.
mass of green acicular to bladed crystals associated with talc and chlorite
massive aggregate of black bladed crystals
aggregates of colorless acicular crystals associated with polylithionite and colorless prismatic leifite
white massive crystalline aggregates on small euhedral jarosite crystals coating the surface of the matrix
colorless irregular shaped crystals, associated with colorless tilasite and berzeliite (r061084).
aggregates of light green prismatic crystals associated with dark rutile
fragmented prismatic dark gray crystals associated with white microcline
dark green to black prismatic aegirine associated with a brown mica and microcline
black prismatic crystals embedded in eucryptite with astrophyllite and magnesioriebeckite
black glassy amorphous, note that a fragment of this sample was heated and is posted at r080045
light brown glassy, from black amorphous sample r060312 after heating at t = 850 c for 18 hours
blue hexagonal prism with pyramidal termination
colorless bladed crystals, associated with yellow ettringite, r070208.
colorless, prismatic and elongated crystals associated with colorless fibers of thaumasite, r060814
spherical aggregate of radiating colorless crystals
green acicular to fibrous in spherical aggregates
sprays of bright green acicular crystals. sample used in morrison <em>et al.</em> (2013) study.
spherical aggregates of small tan colored crystals, associated with cassiterite
green radial aggregate around a bronze red core
pink crystalline massive associated with blue chalcomenite
metallic black bladed and striated crystals, with tarnished surfaces, associated with quartz and pyrite
radiating aggregates of blue acicular crystals
bed of pale greenish-blue bladed crystals associated with green conichalcite r120017
radiating groups of pale pink prismatic crystals associated with pale green co-type (flink 32/22) eveite, r100048
dull dark gray semi-metallic coarse crystals associated with pyrite and calcite
yellow crystals with red realgar. 2-fold twin around [1 1 0].
yellow fine-grained aggregate, associated with red realgar, 2-fold twin around [-1 -1 1].
aggregate of transparent parallel acicular crystals
white cleavage fragment showing polysynthetic twinning, associated with smoky quartz. variety oligoclase.
sprays or white, thin platy crystals, associated with colorless minyulite , r100072, and colorless needles of wavellite.
aggregates or spheres of pale grey, radiating acicular crystals, associated with chalcomenite and clinochalcomenite.
colorless irregular crystals, intergrown with blue chalcomenite, and colorless massive anglesite, on the matrix of krut'aite.
black lath embedded in epoxy, co-type sample
brown elongated tabular crystals, associated with yellow euhedral barite and massive alleghanyite
black patially metamict fragment, note that a fragment of this sample was heated and is posted at r080092
dark brown partially metamict, note that a fragment of this sample was heated and is posted at r080044
dark brown fragment from metamict sample r060418, after heating at t = 850 c for 18 hours
dark brown fragment from metamict sample r050043, after heating at t = 1000 c for 18 hours
dark green prismatic crystal asociated with lustrous magnetite and pale green epidote
bundles of acicular yellow crystals on matrix.
pinkish-brown massive, exposed by etching
aggregate of steel-gray prismatic to platy crystals associated with spherocobaltite
dark green massive, associated with micas and quartz.
massive dark-brown crystals, associated with quartz, mica, and dark-green schorl.
vitreous, brownish-yellow large platelets in clusters with good cleavage in and on dark brown siliceous matrix.
prismatic colorless crystal mounted in super glue.
aggregate of colorless pyramidal crystals
clusters of colorless pyramidal crystals. we have posted cell parameters that match those in the literature, but do not represent the correct cell. the crystals are twinned.
gray metallic crystals with excellent cleavage
isolated or aggregates of pale-yellow green prismatic crystals on petrified wood, associated with gypsum and alunogen. this is the type sample.
colorless platy crystals associated with r060710 holtedahlite
metallic gray blebs in matrix embedded in epoxy, no raman activity because of crystal symmetry
colorless thin tabular crystals associated with yellow sulfur and colorless tamarugite
white fibers in flowing radial aggregates
radial aggregates of light pink fibers associated with green massive dolomite
green blebs to prismatic or needle-like crystals associated with vergasovaite, co-type material
yellow tabular rhombohedra scattered over matrix
colorless compact mass of fibers, along with some sprays of acicular single crystals
granular aggregates of white microcrystals associated with light tan to light purple coquimbite.
aggregate of red radiating platy crystals
pale blue fine-grained massive, associated with wavellite
purple thin micaceous crystals, not a standard polytype, see wiewiora et al (am min 76 (1991) 647-652)
colorless transparent tetragonal pyramids with basal terminations, co-type sample from harvard
blue massive to granular associated with colorless halite
tan colored fine-grained consolidated fragments
yellow-green tetragonal prismatic crystals, associated with needles of gypsum
black hexagonal prism, note that amphiboles from here are characterized by hawthorne et al (2006)
pale green tabular crystals lining fractured rock. probe photo shows two phases. this sample is the lighter phase in the probe photo.
pale green to colorless subparallel aggregates. associated with messelite (r140175).
dark dipyramidal crystals on albite matrix
black tabular crystals associated with metatorbernite r120014
black tabular crystals, associated with r120065, parisite-(ce)
bright yellowish green platy to granular crystals
dark steel gray metallic prismatic crystals with striation parallel to the c-axis. about ten percent of the volume is andorite iv, as determined by x-ray diffraction.
black, massive in polished section, associated with andorite iv and white kutnohorite. andorite vi:andorite iv = 80:20
elogated crystals with striations, associated with wurtzite
dark red-brown to orange semi-transparent druse of crystals associated with quartz.
yellowish orange transparent crystals associated with phenakite
dark green dodecahedral crystals overlying pale green diopside r120003
steel gray platy coating on tan colored dolomite
black metallic massive; associated with malachite
aggregates of pale green thin pseudohexagonal plates
aggregates of green thin bladed crystals
platy transparent olive green crystals coating botryoidal yellow orpiment. co-type specimen.
colorless to white vitreous crystals. variety bytownite.
massive, greyish-green heterogenous aggregates on plagioclase matrix. variety bytownite.
yellow-gray transparent fragment. variety labradorite.
white, waxy flaky crystals associated with tan colored jarosite on quartz
translucent to transparent grey bladed crystals with satin luster (fibrous appearance) associated with hematite
compact massive, light to dark green associated with chromite
blue euhedral crystals exhibiting hemihedral symmetry. associated with colorless barite, yellow hedyphane, and orange wulfenite.
spherical aggregates of pale blue fibers, associated with yellowish-orange andradite and colorless calcite
colorless hexagonal crystals displaying p-3m1 space group symmetry, associated with halite.
pink gemmy massive inclusions in matrix of fine-grained white undetermined zeolite
sprays of colorless to white acicular crystals
twinned crystals shaped like hexagonal prisms
reddish brown platey crystals associated with colorless calcite
dark green prismatic crystals with rectangular shapes
colorless thin plates. same sample as used in kampf (2001) and kampf et al (2011).
transparent sheets, associated with laurelite r100011 and scotlandite r100043
yellowish-brown prismatic single crystal associated with white quartz
coating of yellowish-brown flat hexagonal plates
bronze and blue tarnished rectangular prisms associated with proustite
bronze tarnished rectangular prism. sample used by yang et al (2009) for structure determination.
bronze and blue tarnished rectangular prism.  co-type specimen. twinned.
steel gray with a red hint, mass of poorly formed crystals, associated with pyrargyrite.
dark blue spherical aggregates associated with enargite. the bright, darker, green phase is conichalcite, the light green is unidentified.
pale pink hexagonal tabular crystal, associated with tuperssuatsiaite, and transparent platy polylithionite
gray semimetallic, elongated tabular crystals on coal
transparent euhedral single crystal, synthesized at 1223 deg c with k2wo4 flux. reheated to 600 deg c for 35 days, and quenched. the mg and ti are ordered. crystals were used in the yang and hazen (1998) & the liermann et al (2006) studies.
transparent euhedral single crystal, synthesized at 1223 deg c with k2wo4 flux. reheated to 1400 deg c for 5 hours, and quenched. the mg and ti are disordered. crystals were used in the yang and hazen (1998) & the liermann et al (2006) studies.
elongated prismatic transparent brown, associated with green magnussonite r100027, and white nadorite
yellow to yellowish-orange wedge shaped crystals associated with mimetite and segnitite
green mammillary aggregates associated with yellow and colorless mimetite and calcite
dark red platy crystals, associated with bright red granular or prismatic sewardite (r060720)
dark red platy crystals, associated with yellow tan colored granular aggregates of beudantite,  euhedral red sewardite and quartz
stacked aggregates of pale greenish-yellow hexagonal plates
bright bronze massive with chonchoidal fracture
black oxidized coating of arsenolite over a group of elongated bladed and platy crystals
colorless octahedra crystals on black matrix associated with colorless prismatic claudetite, r050313.
tin-yellow, metallic striated crystal associated with calcite
green crystalline blebs scattered on the barite matrix
pale green tabular crystals coating white anglesite
green tabular crystals associated with linarite and goethite
blocky aggregates of yellowish-brown platy crystals, cell parameters are consistent with a partially dehydrated sample
divergent sprays of green thin prismatic crystals
spherical aggregates of divergent colorless acicular crystals
divergent sprays of clear colorless acicular crystals
colorless fragments from the type specimen, associated with calcioaravaipaite r100033.  photos of type specimen are courtesy of lacmnh.
brownish-yellow transparent fragments associated with dark green chamosite
coating of thin micron sized black platelets
thin black platelets coating grains of quartz
lead gray metallic prismatic crystals in veins in quartz
blue prismatic crystals associated with calcite
sprays of blue prismatic or acicular crystals, associated with calendonite, cerussite.
reddish-orange crystals with pronounced cleavage
brownish orange crystals with adamantine luster. data from cooper et al. (2012)
loose aggregate of colorless transparent fragments
small sharp tan to cream colored crystals, associated with dark brown eulytine
elongated, spherically radiating gray to pale yellow-green crystals, associated with prismatic orange ushkovite and dark green rockbridgeite.
aggregate of pale bluish-green microcrystals
dark green, almost black, single euhedral crystal
sprays of greenish blue lathlike crystals
divergent sprays of light blue lathlike crystals
gray massive crystals tarnished to gold color
radial sprays of colorless bladed crystals, associated with adamite
bright apple-green crust, co-type material, associated with pale bluish green eriochalcite
grayish black polished crystals on microprobe sample mount.
colorless consolidated granular. some of the material consists of transparent gemmy crystals. the unidentified associated yellow material is a thin coating, something like a bubble surface, that turns white under acetone.
silver metallic massive pebbles with brownish-red oxidized coating, variety josephinite
honey-yellow massive associated with pink rhodonite
black stubby prismatic crystal associated with quartz
tan colored water-worn polycrystalline pebble
colorless to brown radial aggregate of bladed crystals
dark brown fragment with prominent cleavage
brownish-purple colored cleavage fragments associated with clear brewsterite and blue richterite
dark blue to black massive and with tabular crystals in vugs, associated with pyrite
dark bluish black bladed radiating aggregates
grayish-green grains associated with brown manaksite r060693, and purple ussingite
blue platy crystals associated with cuprite and brochantite
radiating aggregate of red fibrous crystals on gypsum
silver colored metallic bleb associated with pseudowollastonite. most likely synthetic.
pistachio green crystals in vug associated with pale yellow prismatic mimetite crystals.
radiating group of colorless flattened bladed crystals on white microcline. polytype barylite-1o, formally known as clinobarylite.
colorless long prismatic single crystals associated with aegirine
colorless lamellar aggregate associated with colorless kombatite, r070720, and black jacobsite, r070719
colorless massive, associated with black hausmannite and britvinite r060785
tabular reddish brown massive, associated with phlogopite, bartonite and r070139 erdite
golden brown massive coating with tabular crystals associated with r080028 sabugalite. measured c-cell edge does not match that previously reported for bassetite.
vitreous yellow massive component of a nodule, associated with belovite-(ce), r070163
lead gray metallic with iridescent tarnish and conchoidal fracture
white radial aggregate of bladed crystals
colorless platy aggregate with a hexagonal outline associated with quartz
isolated aggregates of blueish crystals with good cleavage, associated with pale grey walstromite, pellyite, diopside, benitoite, suzukiite (r150039) and celsian
green botryoidal coating asociated with olivenite r050670, malachite balls and azurite
bright green tabular crystals associated with azurite, conichalcite, and wulfenite
sprays of well-formed yellow to white acicular crystals
aggregate of tabular pale yellowish-orange crystals
colorless vitreous pseudo-octahedral crystals and intergrown clusters
colorless vitreous pseudo-octahedral crystals in a yellow crust on brown gadolinite
matted fibrous tan crystals (mountain leather)
fragment of a yellowish-brown hexagonal crystal, co-type specimen
transparent colorless hexagonal dipyramidal crystals
brownish red vitreous massive, associated with bastnasite-(la), r070142; 785 raman signal was overwhelmed by fluorescence and is not posted.
grey tabular crystals associated with quartz
clusters of colorless to yellow acicular crystals
black polished crystals embedded in epoxy, co-type specimen
lead-grey to black-grey metallic massive associated with azurite, malachite and barite, co-type specimen
pale yellow crystals, associated with reddish strengite, and light yellow to pale purple phosphosiderite.
brownish-red fractured-looking aggregate associated with balls of kidwellite
reddish brown bladed crystals in radial aggregates
colorless crystalline crust with reddish-brown massive tilasite and black aegirine
massive white to gray vitreous, associated with lazulite, muscovite and apatite.
hexagonal prisms, with gray transparent terminations. we sample the terminations.
a mass of parallel silver gray metallic prismatic striated crystals
colorless bladed crystals associated with lithiophilite r100096
a red, cut (0.42ct) gemstone, hydrothermally produced.
a cut, green (0.50ct) emerald gemstone, flux grown.
a cut, green (0.48ct) emerald gemstone, hydrothermally grown.
a cut, pale pink (0.39ct) morganite gemstone, hydrothermally grown.
black metallic euhedral grains, associated with pale-yellow sulfur crystals.
light yellow irregular shaped crystal, associated with colorless tilasite and adelite, r060687
aggregate of black bladed to prismatic crystals associated with quartz
transparent brown rhombohedra or pseudocubes associated with green duftite
druse of light green rhombohedral crystals
greenish-yellow blocky crystals associated with mimetite
white efflorescence associated with wurtzite
light pink massive coating blue chalcanthite
white veinlets with distinctive cleavage, running through sanbornite
a group of radiating white to colorless acicular crystals
colorless needles within pale green powdery efflorescence of pickeringite
yellow platy crystals associated with green malachite and orange becquerelite
steel-grey fine-grained loose aggregates, co-type sample
yellow-brown coarsely fibrous massive, intimately mixed with mimetite
pale brown aggregate associated with white hair-like fibers
sprays and aggregates of light green acicular crystals on quartz and pale pinkish almandine, associated with anglesite, pyromorphite, and libethenite. authors sample from the type find.
pale green prismatic crystals embedded in quartz
silver-white tarnished to grey cleavage fragments
elongated tin-white prismatic crystals associated with black cassiterite
steel-gray metallic massive lamellar, associated with quartz.
pale brown flattened spear-head shaped crystals
submetallic black anhedral crystals and grains
metallic black massive or irregular crystals
prismatic or granular light-yellow green crystals.
pale gray-yellow massive with vitreous luster, associated with black hausmannite
colorless rhombohedral crystals embedded in a fine-grained matrix
dark brown massive, associated with dark green dicksonite (r160071)
aggregates of acicular to bladed bundles of blue crystals on quartz
aggregates of very pale blue-green bladed crystals, associated with dark blue diaboleite.
pale gray hexagonal prisms, co-type material
pale green hexagonal tablets, associated with natrolite r120124
blue cubes, associated with blue bladed crystals of mammothite r130100, irregular masses of blue diaboleite, colorless cubes of paralaurianite, colorless gypsum in massive cerussite.
radiating tufts of pale yellow-orange bladed crystals
pale blue effluorescence associated with metallic yellow pyrite and metallic blue covellite
pale blue effluorescence associated with cerussite and malachite
adamantine gray cubo-octahedral single crystals in anhydrite
colorless single crystal tetrahedron with minor cube modifications
colorless prismatic single crystal associated with tincalconite
light bluish-green tabular crystals associated with white cahnite (r110095)
iridescent blue metallic crystal associated with calcite, malachite and hematite
cream-colored earthy coating on tourmaline crystal
aggregate of green bladed to platy crystals
aggregate of orange pseudo-rhombohedral crystals
red-orange aggregate of pseudo-rhombohedral crystals
spherical aggregate of pale greenish-blue tabular crystals
unconsolidated aggregate of transparent to translucent colorless to white grains
polished grey metallic grains embedded in epoxy
isolated blocky reddish-brown crystals associated with yellow vanadinite
dark blue poorly developed crystals forming a crust
aggregate of colorless prismatic to platy crystals
light brown fragment from metamict sample r060613, after heating at t = 1000 c for 18 hours
thin colorless hexagonal plates that fluoresce sky blue under short wave ultraviolet light, associated with colorless quartz
colorless hexagonal plates associated with quartz
white powder associated with pharmacolite, r050537
blocky lustrous black crystals on fine-grained matrix of the same material. note that this is braunite ii, as defined in de villiers (1980)
massive aggregate of pinkish metallic crystals
tabular brown crystals, associated with eulytine
colorless prismatic crystals in radial aggregates
colorless to off-white striated prismatic crystals associated with calcite and pyrite on gneissic matrix
bright gray polished fragment embedded in epoxy
sprays of white bladed crystals, associated with colorless tabular or prismatic gypsum.
adamantine yellow-brown massive crystals, associated with phlogopite
colorless tabular crystals, associated with barite and red hematophanite r070638
colorless thin hexagonal plates associated with romeite, r060736
loose green acicular crystals, mdo1 polytype
green colloidal looking aggregate of octahedra
brownish-red platy crystals. diffraction indicates an i-centered lattice
sharp black octahedra with hematite plates and elongated zn-rich siderite. sample originally from john innes, also the source of single crystal studied by welch et al (2001)
compact aggregate of microscopic randomly oriented colorless acicular crystals
tufts and batches of white acicular crystals with satin luster in iron oxide coated vugs
sprays of acicular white crystals associated with olmiite, r050144
blue to blue-green prismatic, co-type specimen. this is the piece used by selway et al (1997) to determine structure.
brown prismatic crystals associated with blue sodalite, r060405, and dolomite
prismatic yellow-orange crystals embedded in microcline. color is dependent upon light source.
tan colored nodule covered with white thenardite powder
smooth dark brown loose nodules stored in water
sprays of pale yellow, elongated crystals, associated with catapleiite, albite and aegirine
deep blue acicular crystals aggregate on matrix
yellowish-brown granular associated with blue lazurite and white calcite
radial aggregates of brownish yellow acicular crystals
dark reddish-brown pseudocubic crystals associated with black clinochlore and white orthoclase
pale brown colored pseudohexagonal plates, associated with pectolite and albite.
pale yellow tetrahedra associated with colorless prismatic chabazite, botryoidal phillipsite, dark green prismatic augite, acicular apatite, calcite, akermanite, and calzirtite
white tetrahedra associated with bluish green borcarite (r110094)
massive colorless to white. data are from the original description of the type sample. photo is courtesy of bruce cairncross, 7 mm width.
silver thick prismatic crystals with gold tarnish associated with quartz
loose pale gold colored metallic fragments associated with quartz, used to define icdd pattern
gold metallic massive associated with quartz
aggregate of coarse, poorly formed pink crystals, color is pale green under fluorescent lights
granular massive, green under sunlight, light red under microscope light, associated with albite and rhodochrosite
colorless fragments from type specimen, associated with artroeite r100034.  photos of type specimen are courtesy of lacmnh. same sample as used in the kampf et al (2011) study.
pale orange vitreous massive embedded in white dolomite
clusters of pale yellow, micaceous crystals. used in the lafuente et al (2014) structural study.
cryptocrystalline looking, greasy yellow blotches, amorphous
pseudomorph after aragonite, not single crystal. trace of aragonite still present.
transparent colorless cleavage fragments of iceland spar obtained through wards
loose aggregate of colorless cubic crystals, mixed with parasibirskite crystals (r110009)
druse of blue pseudo-octahedral crystals
colorless rounded or poorly formed crystals
colorless to ash-gray striated crystals associated with colorless calcite
black rounded crystals associated with dark brown phlogopite, green granular diopside and black magnetite octahedra
brownish-orange massive. one of 4 specimens collected by sam gordon in 1932 for the philadelphia academy of sciences (#21833)
blue spherical aggregates associated with gypsum and antlerite
pale yellow semicircular plates on colorless albite
colorless single crystals and grains associated with halite, sylvite, and anhydrite.
pink to grey coarse grained, poorly consolidated, melted surface, associated with kainite r100021 and pentahydrite r100022.
orange blocky crystals associated with yellow platy weeksite, r050330
colorless to pale yellow splintery fractured aggregates associated with cinnabar on quartz
aggregate of light tan colored platy crystals
tan colored radiating tufts of acicular crystals
white to pale-blue hexagonal prismatic crystals, associated with light green apophyllite, light yellowish grey stellerite, and light pinkish rhombohedral chabazite.
silver metallic, massive, associated with chalcocite, bornite, digenite and magnesite
spherical aggregates of brown thin platelets
pale tan colored blocky crystals removed from aegirine matrix
gemmy yellow to orange-yellow massive; some cleavage evident, associated with green aegirine
black submetallic fragments associated with calcite and with r120086, goethite
colorless to white elongated prismatic crystals
white prismatic-shaped granular aggregates associated with barite and piemontite
black crystals or grains, exhibiting a greasy luster
pink thin but massive crystalline coating
rosettes of black platy crystals associated with microcline, quartz and rutile
tan colored massive, spongelike, associated with quartz and romeite
light yellow massive pseudomorph after stibnite
dark green prismatic crystals associated with quartz
green, sharp bipyramidal chisel-shaped crystals, associated with green prismatic jensenite. holotype specimen
colorless rhombohedral crystals associated with aegirine
colorless vitreous pseudocubic crystals in cavity
druse of colorless rhombohedral crystals
clusters and druse of clear, colorless rhombohedral crystals
group of colorless blocky crystals associated with phillipsite-na, r061094
black metallic with conchoidal fracture, associated with yellow-red realgar and deep-red smithite, r070642, (with good cleavage).
black metallic grains with conchoidal fracture, associated with red realgar, yellow braded or fibrous wakabayashilite (r150064), and colorless massive or tabular celestine.
group of blue parallel prismatic crystals
iridescent blue irregular hexagonal tablet
dark gray rounded metallic grains associated with ajoite
grey metallic hexagonal tablets associated with stottite r120089, siderite and tennantite
black, twinned, elongated blades, associated with calcite. this is low chalcocite
blue crystalline mass, associated with white needle calcite
blue tabular crystals associated with colorless bladed orlandiite, r100122, and colorless anglesite.
aggregates of blue crystals. the mineral was found on a metallic mining artifact of copper composition.
a mass of small black hexagonal plates, not homogeneous
brass yellow metallic fine-grained massive
groups of green foliated crystals associated with pseudomalachite, r050597
sheafs of green platy crystals associated with white leucophosphite, r060338, and orange cyrilovite, r060504
lead gray metallic bleb associated with azurite
brown hexagonal tablets with curved prism faces
pale yellow transparent anhedral crystals associated with krohnkite and caracolite
purple flaky and massive associated with tan colored tinaksite, r060375
blue transparent tabular crystals in vugs, co-type sample
deep blue interior of hexagonal tablets that are reddish brown on the outside
sky-blue poorly formed prismatic crystals
sky-blue poorly-formed prismatic crystals, associated with violet fibrous elyite, r130277.
pale yellow pseudo-octahedral crystals associated with quartz and cassiterite
long tabular light tan crystals associated with francevillite
light purple massive fragment in a sealed glass vial
black bladed associated with calcite, co-type sample
aggregate of pale yellow to orange thin spearhead-shaped blades associated with orthoclase and intimately with analcime
brown transparent pyramidal single crystals
platy fragment of a pale yellow crystal, co-type material
colorless to gray fine-grained parallel aggregates
white fibrous mass, associated with larger crystals of aragonite
brownish black with submetallic luster, associated with bartonite. note that this is co-type material for bartonite, but there is very little bartonite on this piece.
black submetallic grains with conchoidal fracture, associated with dark-green aegirine and elongated reddish brown lamprophyllite.
colorless beige massive. associated with green ternesite, black-brown jasmundite, small black grains of srebodolskite, ettringite and portlandite.
colorless acicular crystals on pyrochroite
green colored elongated bladed crystals in subparallel group associated with white mendipite
orange bleb enclosed in calcite, associated with red spinel
greenish blue bladed crystals associated with hemimorphite and quartz
thick tabular or short prismatic black crystals, 2-fold twin around a*, associated with light brown rhodonite and colorless orthoclase.
black crystals embedded in a matrix of enstatite
pale greenish blue euhedral single crystal
a cut (1.15ct) alexandrite gemstone, blue-green under fluorescent light, which appears purple under halogen light; flux grown.
a cut, blue-green to purple (dependent on incident light source) (0.80ct) alexandrite gemstone, grown by crystal pulling.
faceted purple alexandrite gemstone, 7.35 ct
green silky fibrous aggregate, transparent in parts
white fine grained compact aggregate associated with light grey dolomite
polished colorless fragment embedded in epoxy in a microprobe mount
red single crystal associated with calcite
red prismatic crystals associated with calcite
light blue massive coating with scattered isolated crystals, associated with dark blue azurite
electric blue platy crystals in massive cuprite
blue green crystal plates and cleavages on cuprite with connellite, atacamite, clinoatacamite r090062. note that this is the same sample used in the burns et al (1995) structural study.
colorless prismatic crystals scattered on the matrix
silver gray with a hint of blue, foliated massive
metamict black semimetallic prismatic, associated with quartz
pale yellow massive on quartz associated with pale green emmonsite and barite
aggregates of dark green pseudo-octahedral crystals associated with malachite
dark green blocky crystals associated with green acicular atacamite, blue claringbullite, r090016, and cuprite. some crystals are tabular, and these are untwinned.
lighter green thin tabular crystals forming v-twins perched on darker green blocky atacamite, associated with black paratacamite. twinned by 120 deg rotation around [2 0 1]
orange platy crust on quartz associated with bismutite
white acicular crystals in vug associated with valentinite, tripuhyite, r070383, and rosiaite, r070384. co-type specimen
aggregates of pale greenish-blue crystals associated with darker blue chalcomenite
dark green micaceous crystals with quartz
pink thick pseudohexagonal crystals, with tapering pyramidal faces. crystals are twinned, with the twin axis along [310].
dark blue prismatic single crystal associated with cornwallite
rich area of dark blue-green prismatic crystals
parallel aggregates of fine acicular dark purple crystals
brown prismatic crystals, associated with pyroxferroite, r141080
transparent colorless prismatic crystals, associated with blue kinoite and colorless platy junitoite, r120100.
yellowish-green blebs in calcite, associated with red spinel, r050184
pale pink massive, associated with red platy lamprophyllite and eudialyte. note that our a-cell parameter is doubled that reported, and our crystal is twinned by a 2-fold around [100]
druse of colorless, clear tabular somewhat pseudohexagonal crystals in vug
colorless tabular crystals associated with ferrierite-k r110200
red-brown to salmon, somewhat coffin shaped tabular crystals in a fragmented geode
aggregates of metallic platy crystals, associated with arsenopyrite and skutterudite.
transparent green micaceous single crystal
brown micaceous plates in dolomite. polytype 1m, variety called seybertite
radiating pale dirty green fibrous crystals
group of sharp metallic cubes with a thin surface alteration, broken crystals have fresher surfaces.
aggregates of light brown fibers on quartz, associated with metazeunerite r110205
pale pink to purple grains scattered through a matrix of chalcomenite, demesmaekerite, and derriksite
black grains in sandstone associated with uranopilite
polished thick section associated with native iron
radiating outward sprays of light brown, acircular crystals
colorless bladed to prismatic crystals with pointy ends. associated with gordonite (r130671), montgomeryite (r140625), and hydroxylapatite (r140987).
colorless thin hexagonal plates associated with strengite and triplite, sample used to update x-ray data in jcpds files
fragment consisting of multiple phases as shown by both x-ray diffraction and microprobe.
metallic bronze massive associated with quartz and pyrite
radiating sprays of reddish-brown prismatic crystals associated with colorless calcite
colorless cubes, extracted by dissolving the matrix of sylvite/halite, associated with strontioginorite r110149, howlite r110150, volkovskite r110151, ruitenbergite r110152, and hilgardite
green botryoidal groups covering adamite
apple-green prismatic crystals, associated with pale blue blocky rruffite (r070431), and pale blue granular barahonite-(al)
green prismatic crystals scattered over quartz
elongated tufts of yellowish-green crystals, associated with ajoite, r120018
mass of cream colored micaceous crystals
yellowish-brown platy aggregates associated with romerite, r060820
purple blocky crystals, associated with voltaite (r060237) and rmerite (r060238).
massive, globular, chalky-white; associated with yellow copiapite
purple hexagonal prisms with incomplete pyramidal terminations, associated with pertlikite r110209 and krausite r110211
tan colored hexagonal prism associated with albite and siderite (raman people, check the id of these associated minerals).the cordylite may be mixed with parisite. need to check this carefully!
black pseudo-cubo-octahedral single crystals, associated with reniform goethite balls
sharp bright yellow prismatic crystals associated with quartz
dark green tabular crystals on quartz, associated with lighter green elongated olivenite
dark gray to black fibrous botryoidal aggregates
dark gray fine-grained aggregate, some thin acicular crystals lining cracks in the rock
spherical aggregates of black fine-grained material associated with vanadinite
druse of reddish-brown pseudo-octahedral crystals associated with pink hureaulite r090070 and colorless ludlamite r090071
brown crystals, associated with colorless or pale-grey vivianite and dark-green rockbridgeite
a red, cut (.49ct) ruby gemstone and rough (.68ct) fragment, flux grown, ramaura produced.
a polished pink (.92ct) ruby cabochon, flux grown, kashan produced.
a blue, cut (.93ct) sapphire gemstone, hydrothermally grown.
a cut, colorless (2.6ct) sapphire gemstone, grown by flame fusion.
a cut, blue (3.26ct) sapphire gemstone, grown by flame fusion.
a cut, red (1.07ct) ruby gemstone, flux grown.
a cut, red (2.76ct) ruby gemstone, grown by flame fusion.
a cut, dark blue (1.51ct) sapphire gemstone, flux grown.
a cut (10.50ct) sapphire gemstone, blue-gray under fluorescent light, which appears purple under halogen light; grown by flame fusion.
faceted yellow sapphire gemstone, 4.70 ct
dark brown lathlike bladed crystals in parallel
parallel group of black metallic acicular crystals
steel gray metallic elongated prismatic crystals associated with quartz
silver metallic prismatic crystals, exterior tarnish steel-blue, associated with quartz and yellowish-green crystals of a bi oxide.
colorless tabular crystals with a melted looking exterior
radiating spherical sprays of colorless lath-like crystals
aggregate of tan colored spherical groups associated with wavellite and quartz
radiating aggregate of acicular pale-green crystals, associated with prismatic yellow hedyphane.
platy iron-black striated crystals with well-defined cleavage planes
black colored rhombohedral single crystal
black poorly shaped, rounded crystals associated with quartz and rutile
blue cryptocrystalline massive, variety opal
colorless single crystals, octahedra and groups of octahedra, some have transformed to quartz. sample used in downs and palmer (1994)
white distorted octahedra associated with colorless labradorite
red prismatic crystals associated with embreyite (r160015)
black elongated prismatic crystals with triangular cross-sections, polytype 3t
lead gray metallic massive associated with umangite
a cut, colorless (1.95ct) gemstone, grown by melting.
iron-black metallic polished fragment embedded in epoxy
gray metallic with purple-red tint, massive
groups of heavily striated orange bladed crystals
orange acicular crystals on a quartz matrix and associated with torbernite
white and colorless spear-shaped single crystal
colorless, striated, prismatic crystals associated with black vesuvianite
colorless to gray, associated with grossular/andradite, melilite and rankinite (r140775).
thin platy blue crystals, associated with colorless hexagonal tabular simonkolleite (r130616). the compound, chemical formula cuzncl(oh)<sub>3</sub>, was found on a metallic mining artifact of copper composition.
radial aggregates of sky-blue fibers associated with green brochantite
vitreous, massive opaque grey associated with calcite and phlogopite
group of yellowish-brown indistinct small crystals associated with leucophosphite, r060338, and green chalcosiderite, r060339
hemispheres of radiating translucent white to colorless bladed crystals associated with heulandite and white balls of mordenite.
colorless cyclical eightling twinned crystals with quartz, tourmaline, and eucryptite
black fibers, resembling steel wool, known as the 4-angstrom structure
gray metallic microblebs associated with cerussite and quartz, author's specimen
black rhombohedral grains associated with red rutile and colorless orthoclase
micro-sized crystals along with perovskite and spinel. transparent with a light-gray color. data from ma & rossman (2009)
white fibrous aggregates associated with blue sodalite on pale green ankerite.
colorless short prismatic crystals associated with calcite, orthoclase, strontiodresserite and quartz
black bladed crystals embedded in quartz and fibrous riebeckite
deep brownish-red color massive embedded in hausmannite, associated with tephroite.
dark gray to colorless cleavage fragments associated with brown lamprophyllite, elongated blue aegerine, light yellow fenakite, grayish brown lomonosovite and very pale yellow to colorless fenaksite (r080135).
dark green to light brownish green bladed crystals
parallel aggregate of colorless-white acicular crystals on black aegerine
pale green thin platy crystals associated with quartz, tellurium, tellurite, and zemannite
dark green crystal associated with metatorbernite, malachite and brochantite
a druse of orange colored thin hexagonal crystals
group of brown thin tabular single crystals
brown transparent closed pyramids, like flattened octahedra, associated with vanadinite
lime green transparent crystal fragment. sample was used in barkley et al (2011)
cream to pale brown streak, a silky luster.  data from kampf et al (2010)
yellow platy crystals associated with yellow acicular parsonsite
pale yellow to colorless pulverant aggregate
colorless faceted crystal with inclusions
pale green or grey greenish euhedral crystals.
colorless triangle platy crystal (spinel twin).
tan or grey octahedral or spinel twinned crystals.
debeers element6 type iia, colorless cut stone
dark green massive, associated with dark brown bobfergusonite (r160069)
unconsolidated mass of hexagonal platelets associated with minor quartz crystals.
light brown radiating acicular crystals, portion of the type material. unit cell is triclinc, twinned around a-axis. the monoclinc cell of hughes et al (2001) is obtained by doubling our b-axis, and transforming.
lighter greenish blue massive, associated with darker blue wesselsite and quartz
light brown fibrous in tufted aggregates
yellow tabular crystals, associated with colorless nitratine
black to deep blue metallic massive, diffraction indicates that this sample is in the high temperature form
dark brown striated prismatic crystals, associated with quartz
aggregate of light green irregular grains
green crystals associated with graphite, r090047
dark green prismatic crystals associated with pale brown epidote, r110127
massive aggregate of pale yellow-green prismatic crystals overlain by dark green andradite r120004
thin tabular reddish-brown hexagonal plates, associated with synadelphite and colorless or grey allactite
grey metallic blebs in a prepared polished slab
aggregate of black metallic prismatic crystals with bluish tarnish
colorless platelets with pearly luster. associated with prehnite and wairakite, r061075
very dark brown prismatic crystal to golden brown crystal fragments associated with euchlorine
colorless crystals and cleavage fragments
grey metallic massive associated with scorodite
pale greenish white hemispherical or sheaflike aggregates of lamellar crystals, associated with anapaite (r141081). the cell parameters do not match messelite, but may be a related phase, perhaps a polytype. needs more work.
spherical aggregates of radiating bladed straw-yellow or colorless crystals, on top of orange-brown siderite and white apatite. type sample
aggregate of greenish-grey platy crystals in a prismatic hexagonal stacking, associated with siderite, rhodochrosite and albite
mauve fibers intimately mixed with serpentine and chlorite
white acicular crystals in a spherical aggregate
greenish-yellow milky tetragonal crystals, associated with waylandite, bismutite, and clear crystal of dreyerite r140327
lead gray metallic prismatic crystals associated with pyrite and dolomite
light green to blackish-green psuedo-octahedral crystals associated with acicular malachite and quartz. the cell parameters are small for duftite.
bright yellow massive, co-type sample, associated with light brown pucherite
radial aggregate of purple acicular crystals
spherical aggregates of pale green acicular crystals, associated with colorless cerussite, anglesite, and blue linarite r120094.
colorless acicular crystals in spherical aggregates on matrix.
equant red crystals with a dusting of white powder
single orange crystal fragment, used in the downs et al (2012) study
light green hexagonal plates lining vug associated with quartz and pharmacosiderite
grayish green coating on acicular millerite
globular aggregates of radially-divergent pearly white flaky crystals
colorless acicular crystals forming spherical aggregates associated with colorless sprays of acicular artinite and green massive chrysotile
metallic silver-white tarnished striated prismatic single crystals
transparent colorless bladed single crystals
orange to brown spherical aggregates on matrix
parallel aggregate of blue elongated bladed crystals
mass of tin-white metallic elongated crystals associated with quartz
black cubes, associated with malachite and cuprite. type sample
aggregates of yellowish-orange bladed crystals
blue massive. a piece from the original find.
micro group of yellow vitreous crystals with a greasy vitreous amber unknown mercury mineral, cinnabar, calomel and native mercury all in calcite.
colorless thick tabular crystals, twinned by a 2-fold parallel to (001)
aggregate of parallel colorless acicular crystals
radiating aggregate of thin black prismatic crystals
pink part of a slice of a tourmaline crystal perpendicular to its c-axis showing pink, colorless and green zones, see also r070563 (white) and r070564 (green)
green outer portion of a zoned watermelon tourmaline slice, see also r060566 (pink) and r070563 (white)
purple grain associated with a white platy chlorite mineral
colorless cubic crystals associated with colorless blades of gypsum
tan colored elongated prismatic crystals
tan colored columnar aggregate of elongated prismatic fibers
white columnar aggregate of elongated acicular crystals
lavender colored acicular crystals on matrix.
violet acicular crystals, associated with sky-blue prismatic chenite, r130278.
light pink massive associated with albite and aegirine, co-type specimen
spray of green globular aggregates associated with pale yellow schmitterite, r060524
pale yellow metallic prisms associated with siderite and quartz
black prismatic crystals associated with pyrite
massive fine grained dark gray metallic, associated with zunyite
compressed aggregate of colorless to white pearly, platy crystals
pale brown bladed crystals frozen in matrix
transparent, pale greenish-brown bladed crystals associated with r120173 pseudobrookite
a radial group of light brown bladed crystals
pale brown prismatic crystals with wedge-shaped terminations
pale pink hexagonal mica books, polytype 2m1
green colored prismatic single crystal associated with quartz, diopside and tremolite
pale brown transparent prismatic crystals associated with green diopside, r110128
globular aggregate of thin tabular peach and white fibrous crystals
white platy crystals associated with pectolite
deep red massive, underneath the weathering product of parallel light brown fibers (goethite), associated with submetallic bartonite, phlogopite, and barytolamprophyllite (r120087); co-type specimen
dark reddish brown platy crystals associated with rhodonite and diopside, this is the orthorhombic polytype, formally known as orthoericssonite.
dark red platy, massive, monoclinic polytype, associated with caryopilite
radiating white crystals with clinoptilolite
a cavity lined with randomly oriented colorless prismatic crystals
colorless prismatic crystals frozen in basalt nodules with chabazite
silver bleb in black isoferroplatinum nugget, polished and embedded in epoxy
reddish-yellow unconsolidated grains, associated with yellow or pale yellow salammoniac.
tan colored massive associated with black franklinite
greasy white massive, co-type specimen. structure reported in tait et al (2010) is from this sample.
reddish-brown prismatic crystals associated with gehlenite, r070478
canary yellow to colorless prismatic and tabular hexagonal crystals associated with colorless afwillite, r070296.
black metallic coarsely crystalline massive
bright green massive crystalline coating
pale-yellow interpenetrant tetrahedral crystals; some transmitting red color of matrix
white or colorless octahedra, associated with r130113 kettnerite, green mottramite
spheres of radiating blue acicular crystals
black glassy submetallic metamict, confirmed by x-ray diffraction after heating, r080101
khaki colored fragment from metamict sample r060856, after heating at t = 1000 c for 24 hours
colorless to very pale blue transparent botryoidal crust. sample is amorphous to x-rays.
groups of very pale green (gray) crystals associated with pink akrochordite, r100028, and colorless barite, co-type (flink 32/22). used for structure refinement in yang et al (2011)
parallel aggregates of white fibrous acicular crystals associated with muscovite
vitreous-clear tabular crystals, associated with cerussite.
transparent tabular crystals associated with fluorapatite
transparent white to colorless lamellar and massive crystals associated with whitlockite
pale brownish yellow massive associated with quartz
pinkish grey, metallic massive associated with dark grey metallic massive to granular goldfieldite, r110023
pinkish grey metallic massive associated with black metallic tetrahedral tennantite r110024 on pyrite
pale yellow transparent fragment, embedded in a polished epoxy mount
isolated colorless octahedra in basalt vesicules, associated with spherical aggregates of colorless phillipsite-ca
brown transparent tabular crystals associated with fine grained quartz
pale brown fragments, variety hortonolite
massive reddish-brown crystals, associated with orthoclase
white, massive powder associated with light blue chalcomenite.
light yellow, transparent, elongated prismatic to platy crystals, associated with dark gray to colorless delhayelite (r070096), brown lamprophyllite, elongated blue aegerine, and grayish brown lomonosovite
dark gray massive embedded in quartz with reddish-orange halo around the grains
brown prismatic crystals on microcline, associated with zircon
reddish brown subhedral crystal; associated with manganotantalite, siderite, pyrite in a polished grain mount
dark brown vitreous amorphous fragments, a portion of the sample was heated and is reported in r080102
tan to light brown colored fragment from metamict sample r070300, after heating at t = 1000 c for 20 hours
gray-brown to black vitreous, results for the heated sample are given in r080103
olive green fragment from metamict sample r070600, after heating at t = 1000 c for 20 hours
yellowish green to dark green submetallic granules (some platy)
black glassy massive associated with green brochantite and blue osarizawaite
black tabular crystals embedded in matrix, associated with sanidine, magnetite and cancrinite.
yellow platy crystals associated with parabutlerite
radial aggregates of acicular colorless crystals associated with clinoptilolite-k r110201
orange lath shaped crystals in radial aggregates associated with white calcite
white acicular crystal in radial hemispheres and lining a cavity associated with quartz
pale tan colored fibrous radiating crystals associated with hematite
radiating aggregate of tan colored fibrous crystals associated with calcite
mat of parallel fibrous yellow-green crystals
colorless acicular crystals, associated with colorless tabular rhomboclase (r070507) and pale yellow-brown rmerite
radial aggregates of green acicular crystals
deep black-blue bladed single crystals embedded in dolomite
black radiating fibrous masses associated with mariite
dark green aggregates of blocky crystals, associated with quartz and muscovite. four different dark green minerals are found: schorl, fillowite, ferrobobfergusonite, and ferrowyllieite. light green crystals are arrojadite. this is the type sample
brown translucent massive. embedded in matrix
massive aggregate of micaceous green play crystals, bright green when thin
dark reddish brown platy crystals, associated with dark brown titantaramellite, prismatic pale-green ferro-actinolite, quartz, and devitoite, r120091.
unconsolidated dark blue to black grains, co-type sample
dark reddish thin platy crystals associated with proustite and xanthoconite. analysis of this sample is reported in bindi et al (2012) and bindi and downs (2022). this is the type specimen.
aggregate of greenish black bladed crystals
flattened black prismatic crystals in semi-sheaflike aggregates, associated with quartz
black vitreous fragments embedded in fine-grained magnetite
dark green fragment associated with yoshimuraite, r050266.
dark greenish black semimetallic massive. the x-ray diffraction results indicate a exsolution texture of ferrokesterite and stannite. according to kissin & owens (1989), based on our cell edges, this sample is at the stannite/ferrokesterite boundary.
black rough octahedron associated with zinkenite.
dark reddish-brown hexagonal tablets, frozen in matrix
colorless to pale brownish tabular or platy crystals in rosette-like aggregates, associated with ussingite.
black bladed single crystal with striations
yellowish silver metallic prismatic crystals. used in the lavina et al (2018) study
unconsolidated brown transparent cleavage fragments
translucent greenish-yellow grains with vitreous luster, known as hollister enstatite
radial sprays of colorless acicular crystals
dark gray massive associated with muscovite
dark green aggregates of blocky crystals, associated with quartz, muscovite, and arrojadite-(bana) (r160077)..
brown crystals frozen in orthoclase, associated with red eudialyte and black arfvedsonite
dark brown coating on octahedral columbite crystals
red platy crystals on acanthite. cell parameters match those reported by bindi et al (2009), indicating a fettelite polytype.
red hexagonal plates, type-sample. analysis of this sample is reported in bindi et al (2012)
colorless prismatic crystals associated with phosgenite, polytype 1a
colorless prismatic single crystal embedded in epoxy, co-type material
black submetallic well-formed prismatic crystals associated with black, poorly-formed ziesite, r070482
dark grey prismatic crystals, associated with hematite
dark gray deeply-striated single crystals
dark grey metallic striated prismatic crystals, associated with galena and sphalerite.
lime-green to yellow-green tablets, on quartz matrix, associated with alunite, backite, cerussite, jarosite and rodalquilarite
bundled aggregate of tan colored acicular crystals
colorless bladed to prismatic crystals, associated with gismondine and white tobermorite
colorless to pale green blocky prismatic crystals
off white massive bleb, fluorescent under short wave ultraviolet light, embedded in white calcite
dark brown crystals embedded in massive enstatite matrix
light pinkish, hexagonal prismatic crystals, associated with black prismatic augite and volcanic glass.
yellow octahedra on ball of colorless stokesite, associated with titanite
small transparent orange octahedrons on muscovite and albite matrix.
dark yellowish brown octahedra on orthoclase
yellow outer zone of 1.5 cm zoned octahedron
brownish-yellow octahedra, associated with hematite, calcite and quartz. type specimen (atencio et al (2013))
black massive, associated with actinolite and omphacite r110038
green prismatic crystal; holotype specimen
green to blue acicular or hexagonal prismatic crystals, associated with opaque nenadkevichite.
aggregates of bladed brownish-orange crystals, associated with natrolite, aegerine, analcime, nepheline, and microcline. type specimen.
red and green prismatic striated crystal, we studied the red part.
dark green octahedron embedded in white albite matrix
black to very dark green single crystal fragment
brown flattened hexagonal prism, polytype 1m
tan colored transparent prismatic crystal
black prismatic, elongated and striated fragment
elongated prismatic purple to black to green crystals
brown massive, strong cleavage, yellowish-brown when thin
pale yellow to light green prismatic or barrel-shaped crystals associated with colorless albite.
deep olive-green tabular plates on calcite crystals
pale green consolidated aggregate of grains
orange-yellow blocky to tabular crystals
spherical aggregates of white or colorless acicular crystals assocaited with yellow siderite, galena and sphalerite. eds shows na, ca and nb.
gray thin laths associated with purple charoite
gray semi-metallic octahedral crystals associated with calcite
pale blue prismatic crystal included in colorless, euhedral anglesite. type specimen.
opaque reddish black striated prismatic crystals, associated with calcite and granular hausmannite.
pale steel-gray striated prismatic crystals
vitreous colorless vein, associated with calcite and yellow roweite, r130073
black bladed crystals in divergent radial aggregates
brown crystals, associated with light brown fillowite.
dark green or brown crystals with good cleavage. type sample
steel gray metallic elongated prisms, associated with quartz, tennantite, and djurleite.
black vitreous, metamict massive, a portion of the sample was heated, and is recorded under r080129.
reddish-brown fragment from metamict sample r070340, after heating at t = 1000 c for 23 hours
a cut, colorless (2.33ct) gemstone, grown by crystal pulling.
matted aggregates of tan colored fibers associated with calcite
colorless to light brown prismatic crystals, co-type material, associated with colorless albite and pyrite. fluoresces green under short wave ultraviolet light.
isolated colorless or grey granular crystals
dark red-brown granular crystals, associated with alleghanyite, psilomelane, and jacobsite
colorless hexagonal prisms with tapering pyramidal terminations, associated with gaylussite
lead-grey metallic cubo-octahedral crystal associated with quartz and calcite
white radiating crystal aggregates completely filling amygdules
radial aggregate of colorless acicular crystals on trolleite associated with wardite
black hexagonal stubby dipyramidal crystals
yellowish-brown anhedral blebs associated with black magnetite and white wollastonite
brown short, tetragonal prismatic crystals, associated with esseneite r061123
stellate aggregates of pale green bladed crystals
massive pink, exhibiting greasy luster, associated with albite
brown crystal fragment, co-type material
deep reddish brown polished fragments embedded in epoxy, co-type material
blocky yellowish-orange crystals associated with colorless analcime
red tabular crystal, resembling wulfenite, associated with quartz, cerussite, caledonite, and matlockite (r140538).
spherical aggregrates of tabular brown crystals with white pyrophyllite on scorodite. this is a portion of the type sample.
light blue crystalline associated with green malachite
steel gray metallic massive, this sample used by bayliss to create icdd data. structure refined to determine space group.
grey metallic massive vein associated with siderite. structure refined to determine space group.
grey metallic massive associated with quartz and annabergite
dark grey metallic grains embedded in epoxy. structure refined to determine space group.
sprays of pale-pink bunched prismatic crystals associated with white willemite, brown sphalerite,  and dark-brown to black franklinite
aggregate of granular vitreous yellow-grey to grey crystals on fe-rich siliceous matrix
brownish yellow hemispheres of gibbsite on black matrix.
aggregates of dark green flat rhombohedra, associated with colorless gypsum and yellowish-green massive gaspeite
aggregates of dark green flat rhombohedra
salmon-red platelets associated with white sanbornite
rose-red cleavage fragment embedded in white sanbornite
aggregate of vitreous dark red platy crystals associated with colorless barite and calcite
black fragment, associated with triphylite, hureaulite, yellow-greenish tavorite (r140539), and black heterosite.
bundles of olive green fibers on dolomite matrix
pink glass fragment beneath fluorescent light, yellowish green beneath halogen
blueish purple glass fragment beneath fluorescent light, reddish purple beneath halogen
grey metallic associated with chalcopyrite. crystal structure solved using this sample, reported in yang and downs (2008).
pair of grey metallic crystals with chalcopyrite embedded in epoxy.
loose aggregate of dark green grains associated with quartz
black, prismatic crystals in a calcite matrix
dark green bladed, associated with colorless quartz
dirty white fine granular aggregates forming spheroidal crusts
pale orange tabular crystals lining vesicles in basalt
pale orange tabular hexagonal plates with low pyramidal terminations
salmon-pink, striated vitreous crystals associated with colorless trapezohedral analcime and colorless tetragonal prisms of natrolite
spherical aggregate of pale brownish-yellow hexagonal plates
compact porous aggregate of white fibrous crystals
short prismatic pale yellow crystals associated with prismatic palermoite and quartz.
vitreous clusters of tabular colorless-to-white crystals with wedge-shaped form, associated with quartz in a vug.
elongated black crystals, associated with r070363, echite
dark grey metallic massive to granular associated with pinkish grey famatinite r110021
aggregates of pale yellowish green bladed crystals on pink coquimbite
synthesized under pressure p = 8 kbars, at temperature t = 1200 c for 12 hours.
synthesized under pressure p = 10 kbars, at temperature t = 1300 c for 8 hours.
the mineral is found as an inclusion in a diamond. this is the type sample.
white spherical aggregate of acicular crystals, associated with colorless analcime
white spherical aggregates of acicular crystals
aggregate of purple-grey colored crystals imbedded in a matrix of quartz and penikisite r060160
groups of pale bluish-green thin tabular crystals on quartz, associated with dark blue herbertsmithite.
aggregates of colorless to pale purple bladed crystals associated with green variscite. the apparent green color of gordonite is due to the variscite.
vitreous clear prismatic lathlike bundles of triclinic crystals. associated with montgomeryite (r140625), collinsite (r140626), and hydroxylapatite (r140987).
radial aggregates of blue bladed crystals
parallel aggregates of dark green acicular crystals associated with dark-brown prismatic childrenite (r140428), light-brown needle greifensteinite (r060588), and white fine-grained leucophosphite
sprays of yellowish bladed crystals with green or colorless vesuvianite, white thick prismatic pectolite and brown phlogopite mica.
grey to pale brown aggregates of elongated crystals, associated with colorless nepheline, elongated pectolite, and white milky microcline.
prismatic pale-yellow crystals, associated with colorless sanidine.
green acicular crystals in spherical aggregates
colorless bladed crystals associated with gypsum and priceite
pale green rhombohedral crystals with iron staining
green platy, bladed crystals intimately associated with blue teineite, r100206, on cuprite
black prismatic crystals, associated with brown rutile, yellow muscovite, green clinochlore and colorless orthoclase
aggregate of anhedral blue-green crystals
colorless fragments from type specimen, associated with laurelite r100035 and pseudograndreefite r100006.  photos of type specimen are courtesy of lacmnh.
light blue sprays of fibrous crystals associated with blue cyanotrichite.
silver gray platelets associated with diopside, r090046
dark lead gray aggregate, including single crystals
dark-gray metallic elongated prismatic trigonal crystals
glassy micro. author's studied material.
red and yellow bundles of bladed crystals
light brown elongated prismatic crystals, associated with dark-brown prismatic childrenite (r140428), radiating green gormanite (r080075), and white fine-grained  leucophosphite.
darker orange-brown blebs in pale salmon colored montgomeryite, associated with tiptopite (r070609)
rosettes of green platy crystals on microcline and muscovite
druse of metallic, bronze-colored octahedra
white (fluoresces yellow under sw)  crystals associated with pectolite (r070607), villiaumite, sodalite, microcline and black aegirine
black crystalline and in some cases striated.
aggregate of greenish-brown colored parallel acicular crystals
parallel aggregate of brown acicular to fibrous crystals
aggregate of tan colored parallel fibers. the penge mine is the source of uicc standard for amosite
mass of interlocking light to dark brown striated prismatic crystals associated with sphalerite, garnet and arsenopyrite
compact mass of silver flattened crystals, exhibiting metallic luster
silver metallic blebs with a blue surface tarnish associated with quartz, stibnite and kermesite, r060742
yellow transparent thin tabular crystals removed from the structure type specimen of cooper & hawthorne (1995) study
fine white powder, with minor component of boyleite
elongated black metallic crystals frozen in white granular quartz and barite mixture
elongated black metallic crystals with striations, on a matrix of tetrahedrite, r100204.
grayish white metallic massive, associated with pyrrhotite-4c and xilingolite r100060. hard to visually distinguish gustavite and xilingolite.
black bladed reticulated crystals associated with arsenopyrite, siderite and pyrrhotite
black alluvial grains, a mixture of guyanaite, bracewellite, eskolaite and quartz, colloquially known as merumite
spherical aggregate of thin pseudohexagonal blades
pink glassy granular crystals associated with green malachite
colorless unconsolidated grains, sample is from speer and cooper (1982)
black massive, associated with dark brown wolfeite
massive dark green crystals (labeled originally as ferrohagendorfite).
prismatic light brown crystals embedded in albite.
spherical aggregates of yellow acicular crystals
spherical aggregates of yellow acicular crystals with albite, uranophane, calcite, quartz, and muscovite
colorless to blue-tinted crystal fragments
loose aggregates of pale blue silky fibers
colorless fragment from a striated prismatic crystal
steel-gray parallel aggregates of prismatic crystals
pale yellow hexagonal prism with pyramidal terminations
colorless to milky-white prismatic crystals
doubly-terminated to tabular brown crystals with striations, associated with calcite and elongated yellow amorphous minerals.
dark green to black crystals exhibiting typical amphibole cleavage
black euhedral crystal embedded in white dolomite with red realgar
unconsolidated reddish brown platy fragments, sample was used to make icdd pattern
group of black pseudo-octahedra with striations parallel to the (001) plane
blue fine-grained massive, associated with wollastonite and calcite
dark gray metallic fragment embedded in epoxy
short, blue to blue-green prismatic euhedral crystals, associated with pale green atacamite
stellate group of yellow, bladed, poorly crystalline crystals
sprays of colorless bladed crystals, co-type sample
pseudohexagonal light brown, twinned crystals associated with colorless thenardite
compacted aggregate of fine-grained material
brownish green prismatic crystals with transparent sections
gemmy drab to olive green orthorhombic prisms lining vug
aggregates of prismatic colorless crystals, associated with lizardite. new mineral, oh analogue of hedyphane, perhaps call it hydroxylhedyphane
parallel aggregates of pale yellow platy crystals
apple green colored, lamellar, fragmented crystals, amorphous, apparently dehydrated
red tinged, steel-gray fragment of a botryoidal mass
black fine-grained replacement of massive but fractured magnetite
a group of black lustrous euhedral crystals
submetallic deep red-brown tabular crystals with colorless calcite, also associated with r070639 britvinite
colorless striated thin tabular crystals in fan-shaped aggregates
metallic tarnished purple coatings and blebs in quartz
black to dark green massive associated with rounded pebbles of quartz
deep blue prismatic pinacoidal crystals with a melted looking exterior
brown spherical aggregates, associated with purple sugilite, brownish quartz and white hydroxyapophyllite-(k).
reddish-brown granular coating on darker andradite
dark green platy crystals in radial aggregates associated with quartz and malachite
greenish-blue thin hexagonal plates associated with hemimorphite, anglesite, and quartz
blue-green crystals scattered on matrix, showing a range of habits from hexagonal plates to pseudo-octahedra
tarnished lead-gray massive polished and embedded in epoxy
dark gray semi-metallic aggregate of pseudo-octahedra, associated with platy chalcophanite.
aggregate of white or colorless tabular coffin-shaped crystals
classic 'coffin shaped' clear colorless crystals showing perfect 010 cleavage associated with white aragonite
green single crystals that grew when the sample was thawed in its collection bag.
pale orange rhombohedral crystals associated with calcite
pink to orange poorly formed crystals scattered over a pale green boracite matrix, polytype 1a
massive etched pink crystallline associated with pale green boracite, polytype 3tc
white, fine-grained massive. cell parameters are given that match dai and post (1995) but the diffraction results indicate lower symmetry.
colorless pillow-shaped aggregate associated with colorless bladed scholzite.
dark green to brown, dependent on light source, prismatic single crystal
tan colored prismatic crystals, variety guarinite
chocolate brown hexagonal prismatic crystal, appearing to have replaced quartz. amorphous
black to dark-brown, translucent amorphous fragments
radiating groups of colorless acicular fibers associated with siderite and microcline. eds confirms ca and nb
pinkish striated subhedral crystals, associated with franklinite and calcite
deep blue individual or aggregates of euhedral crystals.
compact platy crystalline. colorless when thin, but brown when thick.
aggregates of highly irregular pinkish microcrystals, associated with franklinite, willemite, pyrochroite, zincite, and rhodochrosite
yellow bladed crystals embedded in topaz
black semi-metallic elongated prismatic crystals associated with purple fluorite
parallel aggregate of pale purple bladed crystals
blocky crystals; as pseudohexagonal elongated needles, light buff to cream-buff or deep olive-buff in color. crystals are twinned by a 2-fold rotation around [010].
stellate aggregate of pearly white bladed crystals associated with green conichalcite
radiating aggregates of white fibrous crystals
black granular or tabular crystals embeded in thnardite, associated with black bladed or prismatic lyonsite. crystal is twinned by a 2-fold rotation about [-1 -1 1].
black bladed crystals associated with quartz and siderite
dark brown bladed crystals in plumose aggregates
group of tan colored tabular to prismatic single crystals
colorless bladed crystals, extracted by dissolving the matrix of sylvite/halite, associated with strontioginorite r110149, volkovskite r110151, ruitenbergite r110152, congolite r110153, and hilgardite
colorless rounded crystals and fragments
dark brown thin bladed crystals coated with fluorapophyllite, on quartz
blackish brown bladed crystal associated with quartz
aggregate of sub-metallic black platy material
blocky black crystals, associated with diopside, dolomite, pale yellow vesuvianite, and nordenskildine, r130017
sample needs to be returned to bob jenkins after a picture can be taken of it. label shows doubt as to the sample coming specifically from minas gerais.
small yellow granular to short prismatic crystals with good cleavage, grown on aegirine. associated with albite.
bright orange coarse grains, some showing tabular crystal forms
cluster of pink prismatic crystals on reddingite, r090069, associated with colorless ludlamite, r090071
light brown, massive, associated with beryllonite, hydroxylherderite, and apatite. the hurlbutite is very fine-grained holding the other coarser mineral fragments in place.
colorless glassy grains in matrix, associated with, and hard to visually distinguish from quartz
divergent groups of colorless bladed crystals that lie somewhat parallel with each other
tuft of colorless slender prismatic crystals
aggregates of colorless thin hexagonal plates, likely a pseudomorph after plumbonacrite
colorless pyramidal crystals associated with diaboleite
colorless massive crystals, associated with pale bluish leadhillite and colorless susannite. both leadhillite and susannite show good cleavage.
pale orange crust on ferberite with quartz
colorless octahedral ralstonite stained with iron oxide, associated with thomsenolite
white spherical aggregates, sem-eds analysis indicates only mg
orange hexagonal prisms topped with steep pyramids
greenish yellow cubes, associated with ferberite
colorless prismatic crystals associated with kinoite, r050168
white to colorless prismatic crystals on a basalt matrix
yellow dodecahedra and octahedra, type sample
grayish adamantine grains (orange under long wave ultraviolet light) intimately associated with simpsonite (bluish white in sw uv).
tan colored nodule in talc schist associated with serpentinite
transparent pale green hexagonal tablets
transparent tan-yellow prismatic crystals in blue calcite
white massive associated with a dark green tourmaline
colorless or yellowish prismatic crystals, associated with lazaraskeite, chrysocolla, muscovite, orthoclase, calcite, and quartz.
colorless tiny crystals (<50 microns) intergrowth with blue granular meieranite (r140947), massive pale green sugilite, prismatic grey aegirine and bladed white pectolite. cotype sample
colorless to tan unconsolidated grains and fragments
granular white microcrystals associated with prismatic gypsum crystals
pale greenish granular associated with copiapite and barite
yellowish brown vitreous crystal fragment
black, metallic, prismatic crystals with striation, associated with calcite and dolomite
violet isolated crystals, associated with quartz, albite (r180031) and tridymite (r140778).
fan-shaped cluster of pink laths associated with quartz and brown platy hubeite
clusters of pink slender chisel-shaped laths
tin white metallic massive associated with chalcopyrite and quartz
dark purple massive, associated with chrysotile
transparent pale yellow crystals imbedded in nitratine
corroded aggregate of orange platy crystals associated with red wulfenite; structure type sample.
tan colored radial group of acicular prismatic crystals
the sample was obtained by heating cubanite, r061068. it was heated first at t = 200c for a day, followed by t = 160c for five weeks.
colorless crystals, associated with wagnerite, r050519.
white milky massive, associated with cerchiaraite-(fe), diopside, pyrite, quartz, sphalerite, and witherite
semimetallic black crystal with internal brown hints, associated with quartz, spodumene and mica
lead-gray metallic aggregate of acicular crystals
black, with reddish highlights, octahedra associated with kombatite, r070720, and colorless barysilite, r070651
yellowish green translucent fine-grained micaceous aggregates of plates on matrix.
orange-brown elongated tabular crystals associated with quartz, spodumene, and schorl.
brown tabular crystals associated with black prismatic rockbridgeite, r060858
pale yellow blocky to thick tabular crystals associated with scholzite, r080068
spinach-green radiating aggregates, associated with dolomite. sample appears to be amorphous.
reddish-brown bladed crystals coated with white dolomite and associated with dark green duftite
grayish black coarsely acicular crystals
aggregate of black coarse prismatic crystals, intimately mixed with sphalerite
reddish brown prismatic crystals associated with quartz and aegirine
amber-yellow to dark brown rhombohedral crystals
spherical groups of brown bladed crystals
orange-brown spheroids associated with quartz
bright green equant crystals found on the holotype specimen of cesbronite, r080003
pale pink interlocking anhedral grains associated with zincite, franklinite, and hodgkinsonite.
tan transparent cleavages, associated with hausmannite, calcite, and an orange-red granular vesuvianite-group mineral
brownish red vein material with pronounced cleavage
brownish red cleavage fragments, portion of the type sample
reddish brown massive, exhibiting good cleavage
brown pseudo-orthorhombic crystals, associated with black neptunite
reddish brown to black short prismatic crystals and fragments associated with hematite, from type sample
vitreous white small prismatic striated crystals on tips and edges of pink rhodochrosite crystals on beige fine granular matrix, associated with prismatic colorless willemite.
colorless to tan aggregate of bladed crystals associated with rhodonite
pale pink to colorless effluorescent grains
rosettes of colorless blades associated with reddish brown neptunite
colorless blades associated with metallic haussmanite and calcite.
lead-gray metallic pseudohexagonal crystal in dolomite vug
associated with dark blue massive ilsemannite
colorless massive, associated with pyrite, co-type sample
yellow hexagonal prism associated with calcite
a cluster of stacked green crystals, associated with acicular light blue mixite on quartz
clusters of black blades associated with pale green bladed prehnite and quartz
dark gray metallic massive associated with hematite, andradite and rhodonite
colorless thin hexagonal crystals and platy purple aggregates
spray of colorless to pale purple crystals. part of the co-type. associated with green hydroxyapophyllite and clinohedrite, r120105. used in the yang et al (2012) structure redetermination.
spherical aggregates of brown platy and curved crystals associated with dolomite.
large sharp single crystal, translucent red, incorrectly distributed as lopezite
black cleavage fragment with dark-red internal highlites
colorless grains associated with carnallite r070291 and pentahydrite r100022
light brown prismatic crystals associated with quartz and green fluorite
colorless prismatic or elongated tabular crystals with striations parallel to the elongated direction.
colorless acicular silky crystals associated with colorless prismatic apatite, orange akermanite and black augite
white acicular single crystals of kalsilite, associated with thinner colorless fluorapatite and brown tabular phlogopite
light apple green poorly formed crystals, co-type material
spherical clusters of peach colored radiating crystals, associated with colorless calcite and prismatic laumonite. the orange spheres are a mixture of stellerite and a thin coating, assumed to be the kamphaugite-(y), that we cannot confirm (amorphous).
small aggregate of white acicular crystals
colorless hexagonal plates, co-type material, associated with phlogopite, dolomite, pyrite, and magnetite. we only observed the subcell.
yellowish-brown acicular crystals lining cavities
matted coating of orange-yellow thin hairs
colorless platy crystals with a brilliant bluish white fluorescence (short wave), associated with albite, wollastonite, pectolite, and aegirine. crystal used in andrade et al (2013) study
white to colorless powder mixed with small trapezohedral crystals, sample from lager et al (2002) study.
pale yellow to colorless euhedral crystals associated with dark brown andradite crystals
tiny grains of thin black splinters or flakes
colorless sectile crystal plates with perfect (100) cleavage, associated with mimetite
dark gray metallic polished fragment embedded in epoxy
metallic fragment with a green tinge, associated with pale grey magnetite, polished and embedded in epoxy
massive brown crystals with uneven fracture.
red massive crystalline associated with aegirine and nepheline
dark-purple colored single crystals associated with orange colored prismatic vanadinite and calcite
dark red elongated bladed crystals associated with quartz and blue tanished gudmundite, r060741
metallic gray surficially altered to green mushistonite
both colorless and lemon-yellow small platy crystals, associated with r130114 eulytine, and yellow-green mottramite
microscopic blue prismatic crystals embedded in green zincolivenite, r050583, and associated with schultenite, r050584
blue crystals associated with green zincolivenite on matrix of tennantite.
clusters of greenish yellow acicular microcrystals associated with quartz and pyrite.
aggregates of dark emerald-green hexagonal prismatic crystals, this is the -3t polytype, previously known as parakhinite. sample was used in the hawthorne et al (2008) study
light green radiating acicular crystals forming a spherical mat
tan colored hemispheres on quartz, associated with meurigite, r070105
black dodecahedra mixed with andradite and associated with quartz
blue tabular crystals associated with hydroxyapophyllite, r050169
yellowish brown platy crystals in granular matrix of tephroite
spherical aggregates of medium and dark greenish blue mineral associated with pseudo-kipushite
aggregate of vitreous brown rhombic prismatic crystals with conchoidal fracture
yellow-orange tufted aggregates of bladed crystals on stibnite
aggregates of orange short hexagonal prismatic crystals, associated with colorless or white prismatic gypsum. part of the type find.
metallic steel-gray granular aggregates with dull blue-green tarnish associated with umangite mounted in epoxy disc
clusters of dark green radiating prismatic crystals associated with langbeinite, co-type sample
steel gray metallic massive associated with chalcopyrite and siderite
dark grey metallic massive, associated with quartz
turquoise colored short-bladed or tabular crystals associated with gypsum microcrystals coating calcite and hemimorphite
aggregate of orange tabular crystals showing a micaceous cleavage.
steel gray metallic massive polished fragment embedded in epoxy
greenish-yellow prismatic single crystal. used in the yang et al (2007) study
green platy crystal, severely twinned, associated with quartz.
pale rose colored tabular crystals associated with natrolite
yellow irregular crystals with perfect cleavage, associated with black jacobsite, r070719 and colorless barysilite, r070651
green fragments. sample was synthesized by harlow (1997) and used in the origlieri et al (2003) study
bundles of gray acicular crystals associated with ludlockite
colorless prismatic crystals, slightly pink in color when viewed in bulk. this sample was used in the structural study by morrison et al (2012)
pink spheres, radially zoned with kozoite-(nd). surface of spheres are reported to be kozoite-(nd). kozoite-(la) are distinguished from kozoite-(nd) by being closer to white.
pink sphere, radially zoned with kozoite-(la). the kozoite-(nd) is distinguished from kozoite-(la) by being pinker in color.
aggregate of colorless thin hexagonal plates on quartz
pastel blue, vitreous massive, associated with blue sodalite and white ankerite
aggregates of colorless bladed crystals associated with pertlikite r110209 and coquimbite r110210
colorless to white bladed crystals associated with witherite and quartz.
pink spheroidal aggregates and crusts found with other secondary arsenic minerals, quartz and mica
gray metallic prismatic crystal, striated parallel to [001]
pale tan colored, tapering prismatic crystals, associated with albite and quartz
green elongated prismatic crystals with orange natrojarosite and minor colorless leightonite
silver metallic stringers associated with orange siderite and white quartz
acicular metallic golden crystal with blue iridescence, embedded in quartz. space group determined in order to help with the identification.
bladed steel-gray metallic crystals with blue irridescence
deep red vitreous, almost black, blocky crystals and massive. golden-brown, bronze on cleavage surfaces
radial aggregates of bluish green tabular crystals, associated with colorless tabular gypsum crystals.
radial aggregates of bluish green tabular crystals associated with serpierite, r060475
pale-green short-primatic hexagonal crystals, associated with colorless elongated tabular hemimorphite and yellow to brown-yellow andradite.
spherical aggregates of pale green acicular crystals on quartz, associated with triplite
dark brown micaceous associated with orthoclase and aegirine
brownish yellow foliated sample associated with white quartz and dark aegirine.
pale gray crystals with good cleavage, associated with white frolovite and yellow wurtzite
globular aggregates of black, short prismatic crystals, associated with calcite and cahnite
vitreous yellow prismatic crystals associated with natrolite and clinoenstatite.
blue prismatic crystal fragment, slightly water-worn
brownish-red bladed crystals associated with albite
unconsolidated black subhedral grains. type sample
dark green tabular crystals associated with blue lavendulan, r060716, white quartz and barite
massive green on a matrix consisting of quartz and anatase
golden brown translucent platy massive associated with quartz
stellate groups of transparent brown bladed crystals
cream colored, elongated prismatic crystals
black metallic blocky crystals associated with pale red rhodonite r100038
blue skeletal prismatic crystals in snowflake-like groupings, associated with brochantite
pale greenish-blue tabular crystals associated with dark green brochantite
transparent colorless thin square tabular crystals on matrix
pink platy crystals and cleavages on rock. this sample was used in the structural study by morrison et al (2013)
soft, vitreous, opaque white botryoidal crust, in part altered on surface to off-white tiny granules of ammonioborite
flattened aggregate of greenish yellow platy crystals
orange prismatic crystals associated with what appears to be accicular ferristrunzite
white colored elongated prismatic single-crystals
both prismatic and acicular colorless crystals associated with aravaipaite r100032 and scotlandite r100043
colorless fragments from the type specimen, associated with grandreefite r100012 and pseudograndreefite r100006.  photos of type specimen are courtesy of lacmnh.
loose aggregate of black grains associated with platinum r110126
small white fibrous crystal aggregates stored in a sealed glass tube. type specimen
rosettes of blue platy crystals associated with dark green lammerite, r060715
prismatic yellowish-orange on black amphibole
light blue plates, associated with r120019 wesselsite, and r120077 scottyite. this is the type sample.
greenish blue or light blue platy crystals, associated with dark blue scottyite (r141116) and blue wesselsite (with cleavage)
pale blue to blue prismatic or bladed crystals, associated with chrysocolla, muscovite, orthoclase, calcite, and quartz. type specimen (uamm 22052). this is the structure form-1. r190015 is the structure form-2.
greenish-blue bladed or prismatic crystals, associated with lazaraskeite (r180026), chrysocolla, muscovite, orthoclase, calcite, and quartz. this is the structure form-2. r180026 is the structure form-1.
blue hexagonal prisms associated with transparent platy molybdophyllite and susannite
aggregates of yellow to orange euhedral crystals, associated with brochantite.
reddish brown elongated crystals. associated with ushkovite (r060954), atencioite, rockbridgeite, and albite.
brown prismatic crystals, associated with light-brown greifensteinite (r060588), dark green acicular gormanite (r080075), and white fine-grained leucophosphite. type sample.
dark or reddish brown prismatic crystals, associated with grey bladed eosphorite, colorless or white prismatic palermoite (r120141), and natropalermoite (130092).
transparent tan colored flexible lamellar crystal
orange tabular crystals associated with colorless acicular pectolite
reddish orange bladed crystals associated with white natrolite
aggregates of cream-white, sub-parallel prismatic crystals
aggregate of red-brown flattened and platy crystals
rounded colorless crystals embedded in an ash matrix
colorless complete pseudocubic crystal showing trapezohedral faces
pink-tan colored massive, associated with white willemite and pinkish ribbeite (r150125). x-ray shows sample is twinned 180 deg around a.
striated raspberry-red or deep to light pink prismatic crystals, associated with white prismatic willemite
white to pale pink spherical aggregates associated with green chalcosiderite, r060339, and orange cyrilovite, r060504
violet subhedral crystals on a matrix of rockbridgeite and associated with pale yellow acicular segelerite (r080127).
bluish-green prismatic crystal associated with small colorless albite crystals
dark green rhombohedral, as well as apple green druse
thin clear colorless tabular hexagonal crystals coated by chatoyant erionite or offretite on volcanic matrix
white tabular hexagonal-shaped crystals associated with analcime, r060023
dark green prismatic crystals, associated with smaller lighter green pseudomalachite
dark green wedge-shaped prismatic crystals
euhedral vitreous green crystals, associated with r150038 black octahedral trevorite
electric blue acicular crystals in a vug on cuprite matrix.
reddish brown prismatic crystals with fine striations, associated with pyroxene, schorlomite and leucite.
elongated prismatic silver gray metallic crystal, with severe exterior corrosion associated with aikinite, galena, neyite, and gustavite
massive crystalline blebs associated with cerussite, dundasite r060760, and anglesite
dark green tabular crystals associated with antlerite, pseudomalachite, albite, dravite and monazite
pseudhexagonal colorless crystals, associated with grossular
dark reddish brown massive crystalline, associated with sugilite (r130754)
red to red-orange crusts associated with black jacobsite and calcite
tan colored prismatic crystals, associated with brannockite, fluorapatite, albite, bavenite, and pyrite
yellowish brown massive associated with muscovite
parallel aggregate of pale pink acicular crystals, associated with quartz, muscovite, and elongated platy bertrandite, r110025.
colorless fragments and prismatic crystals
brown bladed crystals associated with reddish brown prismatic tantalite, and black cassiterite. used in the menezes et al (2012) study.
blue to green glassy, massive. the two larger fragments are from the 1880 eruption. the smaller fragment is from 1873.
pinkish hexagonal thin platy crystals, associated with cerussite, malachite, rosasite, hemimorphite, mimetite, wulfenite, fornacite, and rarely linarite and kuksite. this is the type specimen.
green blebs of fine-grained serpentine habit, polytype 1t, associated with pearly hydrotalcite
massive transparent golden sheets associated with light green aegirine
gray metallic spears radiating in spherical aggregates, associated with arsenopyrite and skutterudite
steel gray massive associated with quartz
light tan platy crystals associated with orthoclase and lamprophyllite
black interpenetrating cubes associated with green aegirine and sugary microcline
deep red prisms or tabular crystals, associated with prismatic realgar.
a jumbled mass of colorless hair-like crystals associated with black arfvedsonite and white microcline
dark reddish brown bladed crystals, crystal structure is reported by yang et al (2012)
small tan blocky crystals associated with sodalite and microcline
bluish-green groups of colliform aggregates
green tabular crystals associated with siderite, pyrite and quartz
groups of colorless tabular crystals on reddish-brown reddingite r090069, associated with pink hureaulite r090070.
red fibrous crystals that display significant flexibility
black elongated prismatic crystals, associated with pale yellow clinohumite on white calcite matrix
gray glassy and massive, associated with siderite and pyrite
black coarse massive with two directions of obvious cleavage
black metallic crystals with pinkish hue. the electron microscope image shows three distinct fine-scale phases related to as and sb content
radiating aggregates of white platy crystals
reddish-brown radial aggregate of bladed crystals associated with braunite, quartz, calcite
greenish-brown octahedral crystals associated with quartz
orange euhedral prismatic crystals in quartz vugs, associated with blue-green prismatic diaboleite, yellow-orange platy wulfenite, dark grey vauquelinite.
isolated or aggregates of yellow brown prismatic crystals on petrified wood, associated with greenish prismatic alterite, gypsum, alunogen, and sulfur. (to be called magnesioalterite)
blue massive with a parallel fibrous texture associated with white pickeringite, co-type specimen
radial tufts of vitreous white acicular crystals on typical franklin hill zinc ore. the crystals are twinned by a 2-fold axis parallel to a*.
black poorly formed octahedral crystals with deep red highlites, associated with hematite and calcite
euhedral brown crystal embedded in matrix
prismatic brown to orange-brown crystals
dark brown to black prismatic crystals frozen in albite
black bladed single crystals embedded in a white matrix of calcite
light bluish gray fibrous cloth-like fabric
rounded hexagonal purple crystal with pyramidal terminations
dark grey with a hint of purple, flattened tabular hexagonal crystal
greyish purple flattened tabular hexagonal crystal
black octahedra, the surface is hematite and the interior is magnetite
black rounded octahedra associated with phlogopite and diopside
black submetallic grains and octahedra associated with light green massive willemseite
dark green isolated granular or octahedral crystals, associated with yellowish-green irregular veins of nimite, minute light-green opaque grains of willemseite, reevesite as yellowish-green massive earthy vug material and limonite.
dark green massive, associated with brown armangite r100041, and white nadorite
silver gray metallic polished fragment embedded in epoxy
dark yellow massive associated with wollastonite and garnet
pale tan colored grains disseminated through the rock
tan colored tabular crystals with a subconchoidal  fracture on a broken surface.
white to cream spherical aggregates of acicular crystals associated with colorless albite, dark green aegirine, octahedral pyrochlore, and yellowish titanite.
yellowish flat lying plates, divergent groups on matrix.
blue bladed crystals, associated with blue cubes of boleite r130099, irregular masses of blue diaboleite, colorless paralaurionite, colorless gypsum in massive cerussite
pale brown massive associated with grayish-green bario-olgite, r060614, purple ussingite and colorless serandite
botryoidal coating of tan colored pseudohexagonal plates on red tourmaline and gray feldspar.
pale blueish green bladed crystals, associated with light brown granular natrojarosite and colorless quartz
acicular salmon-colored crystals, orthoclase, quartz, and allanite
divergent black acicular crystals (with dark brown lights) associated with gaudefroyite in gypsum cleavage plate
bundled aggregates of steel-gray metallic prisms
red massive associated with orthoclase, nepheline and aegirine
dark red bladed crystals and cleavages associated with braunite
dark red granular, associated with namansilite, r070006
dark reddish-brown single crystal cleavage fragment.
deep red massive, good cleavage, associated with raite r060854, and orthoclase
tetragonal stepped crystals associated with proustite and alabandite.
dark green coarse prismatic crystals associated with calcite and red zincite
deep reddish-brown prismatic crystals associated with black hausmannite
red-brown massive, associated with quartz
black submetallic elongated prismatic crystals on quartz
sharp pale rose crystals, fairly transparent.
group of green tabular, rectangular crystals, from the original find
yellow earthy, massive, sponge-like appearance
pale lilac mica associated with lilac colored axinite
white prismatic crystals, associated with calcite
yellow tetragonal prism with pronounced striations along the c-axis direction
heavily striated pale yellow elongated prism
pale yellow striated prism; bright orange-pink fluorescence under sw uv light
loose yellow prismatic crystals, work is done on the upper yellow crystal
compact radiating aggregate of gray prismatic crystals (with bluish to brownish sections) in phosphate nodule.
spherical radial aggregates of white bladed crystals associated with yellow mimetite
colorless to pale bluish-gray anhedral crystals
green bladed crystals on quartz. this is the type specimen
black with carmine-red internal reflections, massive
pale yellow vitreous tetrahedra associated with colorless cerussite
massive aggregate of parallel prismatic or bladed yellowish orange crystals
massive aggregate of elongated or bladed grey to grey-brownish crystals
colorless granular crystals in a vein. the matrix is a mixture of quartz and bixbyite, associated with schizolite
yellowish green triangular shaped flattened and striated crystals, associated with guilleminite and green brochantite.  sample is from the same specimen used in the cooper and hawthorne (2001) study
tan colored spheres forming a crust, associated with apjohnite
white or colorless tabular, prismatic, granular, or bladed crystals, made by drying the liquid.
pale yellowish or colorless platy crystals, associated with bright orange georgerobinsonite (r110148), quartz, and cerussite.
radial aggregates of colorless hexagonal prisms associated with elongated bladed striated blue-green caledonite and creamy yellow barite
reddish brown wedge-shaped crystals, many v-twinned, associated with quartz and scorodite
red prismatic crystals in quartz matrix associated with hematite
pink massive platy associated with black sphalerite and milky-white quartz. metatype sample.
aggregates of greenish blue radially fibrous spherules
aggregates of granular blue crystals, associated with massive pale green sugilite, prismatic grey aegirine and bladed white pectolite. type sample
colorless sub-millimeter equant inclusions within pink gillespite crystals. type sample
black, massive exhibiting greasy luster, associated with colorless to pale brown bladed yangite (r090031). sample is from the john innes collection.
radiating aggregates of black prismatic crystals
colorless acicular to fibrous crystals associated with gypsum
lead-gray metallic slender prismatic and striated crystal
elongated silver-gray metallic crystals embedded in quartz and associated with calcite
rootbeer colored dodecahedra associated with calcite, phlogopite, clinohumite, pyrite and magnetite
globular aggregate of white grains, similar in appearance to a snowball
sprays and clusters of colorless prismatic crystals associated with calcite. merlinoite crystals are twinned with 90 deg rotations around c-axis.
colorless aggregates of irregular grains, associated with forsterite, enstatite, maskelynite, feni metal, troilite, chlorapatite, chromite and ilmenite.
white fibrous mass, associated with barrierite
book of yellowish-green thin tabular crystals
pale green thin tabular crystals with rectangular outline
dark green prismatic crystalline bundles
tan colored divergent radial spray of bladed crystals
aggregates of yellow play crystals, associated with green platy metazeunerite
dark red semi-metallic botryoidal groups
emerald-green tabular crystals associated with quartz and muscovite
green tabular crystals associated with anatase r120013
green tetragonal platy crystals associated with phosphuranylite r130108
green platy crystals, associated with fluorite, quartz, chrysocolla, and chalcopyrite.
yellow platy crystals with minor intergrown quartz
group of pale green acicular bladed crystals
green tabular crystal, cell parameters indicate a disordered structure
green blocky dipyramidal single crystals associated with yellow walpurgite, r050573
pale green platy crystals associated with cobaltlotharmeyerite r070400. cell parameters indicate that this has a disordered structure.
rosettes of yellowish-orange fibrous elongated crystals on quartz, associated with tan colored spheres of kidwellite, r070106
pale yellow spheres on black cryptomelane
dark gray metallic fragment, hints of internal red
a mechanical mixture of dark gray metallic polished grains and pale yellow vanadinite embedded in epoxy
tan colored euhedral crystals associated with black arfvedsonite
bluish-green fragments embedded in epoxy, co-type material. originally labeled as 'natrobistantite', a discredited species.
aggregate of parallel striated colorless crystals
pale yellow tetrahedra, associated with hexagonal plates of iodargyrite
sprays of pink thin prismatic crystals associated with siderite and cuproadamite
pale yellow-green hexagonal fragment associated with calcite
fragments from a pale yellow green hexagonal prism
pale yellow hexagonal prisms, associated with minasgeraisite-(y) r120134
pale brass-yellow prismatic crystal with pronounced striations, associated with calcite and green grossular
bronze colored metallic fibers associated with chalcopyrite and quartz
creamy white massive associated with white calcite. crystal structure analysis demonstrated full occupancy by pb with no ordering of ca.
pale yellow transparent hexagonal prisms, monoclinic polytype
colorless thin hexagonal prisms associated with quartz and anglesite
yellowish green crystals coated with white feathery hydroxylapatite.
purple crystals on muscovite, associated with milarite r120135
glassy blue crystals on patronite, associated with r130366 retgersite
radiating colorless transparent thin prismatic crystals
parallel aggregates of tabular colorless crystals associated with sprays of white, thin platy aldermanite, r100073, and colorless needle wavellite.
massive pink fine fibers associated with eudialyte, wollastonite, and orthoclase
pale purple mass of prismatic to flaky fragments
radiating aggregates of bluish-green acicular crystals
colorless fragments from a broken high pressure anvil cell
a cut, colorless (0.45ct) gemstone, sublimation grown.
foiliated gray colored, represents the 2h polytype
steel gray distorted hexagonal tablet on quartz
apple green tabular crystals associated with yellow wulfenite
pale green prismatic crystals associated with dioptase
tabular grass-green crystals, associated with wulfenite, malachite, and quartz
tabular olive-green crystals, associated with wulfenite and malachite. note that the c-cell edge is half of what is usually reported.
yellowish white tabular crystal with good cleavage, associated with calcite
colorless tabular crystals associated with hausmannite, with cell parameters that match the so-called molybdophyllite-18 phase (kolitsch et al, 2012)
pale peach semi-transparent crystals associated with quartz
fine-grained tan crust on white newberyite
elongated cluster of grayish white fibers at the base of a cluster of terminated quartz crystals
single bladed pale pink crystal, cell parameters are significantly different than those reported
translucent reddish orange tabular crystals associated with orthoclase.
lime green clusters of flattened laths with poor crystallinity
colorless lathy crystals with striation along the elongated direction. associated with gordonite (r130671), collinsite (r140626), and hydroxylapatite (r140987).
colorless to light gray translucent crystals associated with pale yellow vesuvianite
red prismatic crystal with quartz, cinnabar and greenish yellow edgarbaileyite, r060500
red crystals with good cleavage, associated with yellow terlinguaite (r130878).
tan fragment showing well-developed cleavage
colorless or pale yellow tabular or prismatic crystals, associated with yellowish cervantite
colorless to tan fibrous crystals associated with beryllonite
pale purple massive associated with white fluorapatite and colorless augelite
isolated yellowish-brown prismatic crystals in feldspar, associated with dark-green epidote, dark-brown astrophyllite, colorless fluorapatite, pinkish fluorite, and pale yellow monazite.
radial sprays of yellow transparent needles, variety duhamelite; associated with goethite
very pale yellow cement to microcrystalline
red to very dark red short prismatic striated crystals associated with datolite, calcite, hausmannite, and pectolite
orange-red massive, associated with colorless sanbornite with good cleavage, diopside, and witherite.
scattered orange grains and aggregates associated with taramellite, walstromite and sanbornite.
isolated orange granular crystals, associated with quartz and sanbornite. note that the c-cell edge is doubled relative to the literature
blue acicular to prismatic crystals with tapering terminations, associated with brochantite and cerussite
jackstraw aggregate of blue bladed crystals
black octahedral or cubo-octahedral crystals, associated with green prismatic dioptase
tan colored micaceous crystals of 2m1 polytype
pale-yellow transparent mica, polytype 2m1
yellow fine-grained earthy aggregate with green acicular malachite
brown thin tabular plates, co-type material
stacks of parallel pseudohexagonal white plates
deep sky blue to white acicular crystals in serpentinite.
dark red granular, associated with ungarettiite, r050244
pink colored fragment of a single crystal associated with gypsum
dark green irregularly formed crystals associated with quartz
clusters of dark green thin tabular crystals on matrix
very pale-green platy crystals, associated with colorless gypsum and green ramsbeckite.
orange octahedron, associated with black ilvaite, colorless fluorite, calcite
pale yellow massive, x-ray diffraction indicates that this is amorphous
sheaflike, dark brown to red-brown aggregates
golden brown rhombohedral crystals associated with colorless to pale purple phosphosiderite
radial aggregates of colorless bladed crystals
white to colorless prismatic crystals associated with aegirine
colorless transparent prisms associated with bhmite r120123
colorless, prismatic, striated, elongated along [100], visually indistinguishable from palermoite (r120141). associated with grey to colorless bladed eosphorite, groups of acicular childrenite, quartz, goethite and lefontite r140539. type sample
gray colored plates associated with black arfvedsonite
reddish brown acicular crystals coating a vug
translucent brown zoned pseudocubic crystals associated with calcite and clinoenstatite
globular to radial aggregates of thin white acicular crystals associated with colorless apophyllite
stacks of brown hexagonal plates, associated with sphalerite and calcite
cluster of pale-pink translucent tabular pseudohexagonal crystals, associated with analcime
white massive mixture of 88% nepheline, 12% cancrinite
colorless blocky crystals coated with colorless sodalite with electric blue inclusions, on a marble matrix
green fine-grained massive associated with quartz
deep red-black fragment of a prismatic single crystal
aggregates of light brown platy crystals
spherical aggregates of blue tabular crystals
unconsolidated lead-gray elongated crystals with stepped surfaces
massive metallic lustered tarnished to dull copper color
black sliver of a phase, associated with kamacite and diopside
aggregate of silver-gray cubes, some tarnished to a brassy color
silver dodecahedral crystals, dissolved out of calcite
small pale green to colorless acicular crystals
pale blue to colorless lamellar aggregate
black platy crystals and cleavages, massive
brown tabular platy crystals associated with quartz
yellow prismatic crystals on calcite matrix
pale blue bladed crystals associated with green malachite
unconsolidated, granular fragments exhibiting a sandy color
green granular massive mixed with quartz
colorless aggregates of tabular crystals
colorless to tan sheaf, associated with diopside, vesuvianite, and hulsite, r130016
pale brownish tabular crystals in rosette-like aggregates, associated with ussingite
colorless when thin, grey when thick, with good cleavage
single crystals as colorless radiating clusters and tan thick tabular crystals
aggregates of colorless to white tabular crystals, associated with white natrolite, apatite, dark prismatic aegirine and annite
radiating aggregate of brown bladed crystals, twinned around (001)
dark brown platy massive cleavages associated with purple sugilite and blue wesselsite.
steel-gray striated prismatic crystals in quartz
bright silvery-white metallic massive associated with quartz
aggregates of pea-green grains associated with quartz and jarosite, type material
fine grained lime green coating on quartz
pale blue prismatic crystals frozen in quartz and muscovite matrix
dark green prismatic crystals on botryoidal bayldonite r050670
tan colored prismatic crystals associated with fibrous bultfonteinite, r050088
sprays of colorless prismatic crystals. this sample was originally labeled as mandarinoite.
yellowish sharp acicular crystals, associated with blue chalcomenite, dark blue prismatic chmiederite, and pale yellow molybdomenite
aggregates of colorless prismatic crystals.
white aggregate of prismatic or elongated bladed crystals with striations. crystals are twinned with a two-fold rotation along [0 -1 1]*.
green granular massive associated with brown grossular and clinochlore
pale green granular crystals associated with fluor-dravite r110031
gray or pale-yellow gray massive crystals
orange-brown glassy fragment, variety is opal-ct, based on its x-ray diffraction pattern
colorless cloudy glassy fragment, variety opal-c
colorless to blue tinted glassy amorphous fragment, variety opal-a
polished iridescent fragment, opal-ct. there is probably some polymer filler included, based on x-ray diffraction pattern
a polished white cabochon (2.03ct), solution grown.
white polished cab, raman spectra matches polymethyl methacrylate (plexiglas)
black polished cab, with raman spectra that match libyan desert glass
polished tear drop-shaped cabachon, 1.37 ct, raman spectra matches polystyrene (plastic)
colorless radiating bladed crystals associated with blue chalcomenite, r100123, and colorless anglesite.
cluster of white wedge-shaped crystals, variety adularia
green crystal associated with topaz. single-crystal structure refinement was conducted to demonstrate that it is orthoclase.
green fragment. crystal structure determined to demonstrate that it is orthoclase
colorless single crystal with a habit similar to adularia
white to colorless, massive, in a granitic rock
light blue aggregate of lathlike crystals
blue-green platy crystals in masses with chrysocolla
grey metallic massive, variety iridosmine
black tabular distorted hexagonal crystals associated with colorless tridymite
light blue to colorless, short prismatic or tabular hexagonal crystals
pale blue short prismatic or tabular hexagonal crystals, associated with acicular mullite, colorless sanidine, reddish rutile.
loose red-brown granular glassy fragments intimately associated with mopungite
clusters of pale yellow-green spear-shaped crystals, in subparallel to divergent intergrowths.
black pseudohexagonal flakes, triply twinned with a 120 deg rotation around c*
aggregate of metallic black acicular crystals associated with quartz
dark brown to almost black platy crystals, associated with schorlomite, pyroxene, leucite and nepheline
dark brown to almost black platy crystals, associated with sodalite.
black grains embedded in quartz and orthoclase
black metallic bladed crystals associated with needles of stibnite crystals
silvery-gray metallic, elongated but platy, crystals in spherical aggregates associated with dolomite and kermesite
colorless, with a faint hint of pink, lamellar crystals associated with actinolite, diopside and calcite. strongly fluorescent under short-wave ultraviolet light
white to colorless translucent prismatic crystals
brown fragment associated with red ruby corundum
dark-red massive crystals associated with calcite, quartz, and muscovite
striated, colorless, elongated prismatic crystals, associated with quartz, radiating childrenite, natropalermoite (r130092), and lefontite (r140539).
colorless prismatic crystal, associated with quartz
granular aggregate of orange microcrystals
purple pseudo cubic crystals, water soluble
colorless elongated subparallel aggregate of crystals
clear to pale violet melted looking blobs or elongated tabular crystals, associated with clear to white hexagonal prismatic penfieldite, blue tabular pseudoboleite, and colorless tabular gypsum.
yellow-orange, vitreous-opaque, poorly crystalline to amorphous, secondary alteration coating on realgar, associated with realgar and calcite.
yellowish-orange granular, within a rind of realgar
spherical aggregate of brown platy crystals on colorless bobdownsite
radial spray of colorless elongated flattened prismatic crystals
loose aggregate of colorless tabular crystals, mixed with calibo3 crystals (r110010)
aggregates of parallel tan colored acicular crystals associated with zircon
pale green prismatic crystal embedded in calcite
brown hexagonal prismatic crystals, associated with white quartz
pale orange hexagonal prismatic crystals, associated with r120064, anatase
yellow acicular crystals in radial aggregates
lead-gray to gray-black metallic massive
vitreous colorless to pale-yellow cubes and dodecahedra
black metallic distorted crystals associated with quartz and galena. x-ray diffraction shows that this is pearceite-tac.  unable to obtain raman spectra without burning the sample.
black tabular hexagonal prism in quartz. x-ray diffraction shows that this is pearceite-tac.
aggregates of black hexagonal plates, x-ray diffraction indicates that it is type t2ac.
colorless platy microcrystals associated with griceite, r070436
colorless tabular or prismatic crystals with conchoidal fracture, associated with suzukiite (r150039), walstromite (r150079), and bavsiite.
colorless pyramidal crystals, associated with blue pseudobolite, r050162
aggregate of green crystals in quartz associated with purple gorceixite, r060158. crystal used in the bowman et al (2013) study.
pale bluish green massive associated with quartz
unconsolidated aggregate of colorless grains, mixed with starkeyite
unconsolidated coarse crystalline grains associated with anhydrite
colorless well-formed tabular crystals associated with carnallite r070291 and kainite r100021.
colorless thin plates, with red incrustations of valentinite
parallel aggregates of tan colored hexagonal plates
pale straw-yellow granular, associated with fluorite, hemimorphite, quartz and chlorargyrite
groups of black cubo-octahedral crystals
black square prismatic crystals associated with white calcite, yellow monticellite and yellow diopside
isolated grey-to-black octahedra frozen in matrix, associated with wollastonite r120122, spurrite and gehlenite
sharp black cubes, associated with kermanite, r130036
reddish brown thin bladed crystals associated with white cerussite
reddish brown acicular crystals associated with green or pale-green  cornwallite, light-yellow barite and quartz
gray metallic polished fragment embedded in epoxy
green transparent tetragonal prisms associated with coquimbite r110210 and krausite r110211
pale yellowish brown massive associated with aegirine, albite, natrolite, astrophyllite and rhodochrosite
tan colored cleavage fragment associated with catapleiite
colorless bladed or tabular crystals, associated with blue chalcomenite and greenish blue clinochalcomenite.
pale yellow or pink (depending on light source) hexagonal prismatic crystals, associated with albite and aegirine.
spray of yellowish-green acicular crystals, type sample
steel grey metallic fragments with subconchoidal fracture, sample used as the standard for the icdd powder diffraction file
pale green, yellow and colorless transparent single cubes associated with quartz
spherical aggregates of white acicular crystals
aggregates of green and brown cubic crystals associated with gypsum
aggregate of olive green spheroidal masses
colorless pyramidal crystals, associated with yellow mimetite
aggregates of colorless cubic crystals with brown coating, associated with cuprian adamite
dark green, almost black subparallel rosettes, associated with lighter greenish blue spherules of zapatalite
coating of colorless pseudo-octahedral shaped crystals
radial aggregates of colorless prismatic crystals, associated with calcite
spherical aggregates of translucent white blocky, pseudotetragonal crystals, associated with chabazite-na, r070440
spherical radiating aggregates of clear colorless prismatic crystals with pyramidal terminations; sample is from the tiba et al (1995) study, co-type specimen
dark brown pseudo-octahedral crystals on matrix
euhedral dark-grey zoned crystals with striations. interior is colorless, clear, and exterior is dark brown. this sample represents the interior, the exterior is r140624.
colorless prismatic crystals associated with colorless gypsum, co-type sample
colorless hexagonal prisms with long pyramidal terminations
bluish-purple fine-grained botryoidal and tabular crystals
divergent sprays of bright yellow acicular crystals
elongated purple single crystals associated with albite and romeite, r060323
grey to yellow prismatic crystals associated with white anorthite and dark biotite
dark-grey crystals embedded into matrix of calcite, dolomite and tephroite
steel gray metallic massive, associated with rhodostannite, r120139. this sample was used in the schumer et al (2013) study.
colorless transparent hemimorphic tabular crystals
colorless hexagonal prisms. note this is not really pitiglianoite, needs chemistry
sprays of bright green acicular crystals
light blue radial fibrous, chatoyant crystals with drusy malachite
sprays of blue fibrous or acicular crystals on matrix
small silver water-worn nuggets associated with laurite r110120
black tarnished metallic prismatic crystals.
black twinned crystals associated with red scrutinyite, r080018, on the surface of a quartz crystal
matted white fibrous aggregate with calcite
grayish blue botryoidal crust associated with yellow-green pyromorphite
pale blue crust associated with dark blue linarite and teal colored caledonite
grayish blue botryoidal crust associated with pale yellow pyromorphite
colorless hexagonal bipyramidal crystal on cerussite
white massive crystals, associated with deep blue boleite, blue diaboleite, and pale bluish leadhillite
glassy pale blue massive, with a well-defined cleavage.
dark bluish-gray semimetallic inclusion in os,ir,ru matrix. the sample is a polished fragment embedded in epoxy
metallic, iron-black with reddish hints; pseudohexagonal tabular crystals associated with hexagonal prisms of stephanite
reddish-bronze tarnished metallic fragment associated with green clinochlore and white actinolite
grey metallic massive associated with clinochlore
pseudohexagonal micaceous crystals with small white natrolite, red rhodochrosite and white albite
white flexible platy crystals associated with calcite
blocky light blue crystals associated with dark blue linarite
black fragments, structure is published in can min 14 (1976) 346-356
black blocky euhedral single-crystal, from the original find
transparent brown water worn crystal fragment
dark blue-green amphibole with pronounced cleavage, associated with white albite and red eudialyte
colorless transparent prismatic single crystal, also known as kdp (is this archerite???)
bright-yellow to honey-yellow drusy crusts associated with green emmonsite
pale green thick tabular crystals, associated with blue azurite, green elongated szenicsite (r100179) and colorless granular prosopite (r100181).
aggregate of pale green prismatic crystals
spherical aggregates of colorless thin bladed crystals with distinct cleavage along the blades
black prismatic crystals and massive in quartz
dark green prismatic crystals in a polished thick-section (5 x 5 x 0.5 mm in dimension). dr thomas collected the sample in 1969
spray of colorless acicular single crystals
colorless granular crystals,  associated with blue azurite, green elongated szenicsite (r100179) and pale green thick tabular powellite (r100180)
gray prismatic to fibrous associated with pyroxmangite r060999
blue crust, associated with yellow penfieldite, r050163
indigo blue cubic or short prismatic crystals, associated with colorless quartz
dark brown tabular, associated with r120174 enstatite
dark brown tabular or elongated crystals. associated with sanidine and mullite (supposedly).
colorless crystal fragments from the type specimen, associated with laurelite r100035 and grandreefite r100012. photo of type specimen is courtesy of lacmnh.
pale yellow-orange prismatic to thick tabular pseudohexagonal crystals, associated with albite
dark-green tabular crystals associated with chalcosiderite, r060007
white massive associated with barringerite, r070439
colorless synthetic crystal fragments from the study by yang and prewitt (1999)
brown tabular crystals associated with green namibite. pale yellow crust is also pucherite.
reddish brown tabular crystals associated with greenish yellow bismutite
pale green radiating fibrous to bladed crystals
aggregates of dark-green acicular crystals, associated with light green epidote
prismatic single crystal, deep red color on freshly broken surface
yellow-brown metallic prismatic crystals with light blue tarnish, pseudomorph after argentopyrite. even though they look like good crystals, the sample is extremely fine-grained.
dark-bronze and blue, tarnished pseudohexagonal prisms; bright grey when a fresh surface is exposed. associated with wire silver. these crystals were labeled argentopyrite, but are pseudomorphs.
pale bluish-green hexagonal tablets embedded in calcite, associated with magnetite
fiery-red grains on light-pink calcite vein
reddish-brown octahedral crystals associated with calcite
red-brown octahedon superficially altered yellow, chemistry does not match any ima approved mineral name.
dark brown irregular grains on microcline
gray massive with small crystals in crevices
aggregate of steel-gray prismatic crystals
deep red water worn pebble, variety rhodolite
colorless massive, associated with muscovite, quartz and small black rutile
light purplish-red gemstones. x-ray diffraction and raman spectra were collected from the gemstone on the left.
red-brown platy crystals with deep red internal hints, associated with barite
brownish orange massive associated with galena
blocky transparent green crystals coating a surface of a rock. single crystal x-ray diffraction shows that this sample is composed of exsolution lamellae of diopside and jadeite
vitreous pinkish granular crystals, associated with black magnetite.
red-brown isolated crystals, associated with colorless tridymite, sanidine, and clinoferrosilite (r141085). crystal is twinned by 180 deg rotation around (111).
pink bladed crystals frozen in matrix associated with protomangano-ferro-anthophyllite r061000
pale yellow to brown semitransparent massive associated with quartz
bronze-yellow metallic tabular hexagonal prisms
brass colored, prismatic crystals associated with quartz and dolomite
colorless to white granular massive with excellent bladed cleavage on individual crystalline grains
short hexagonal prismatic white crystals, associated with sodalite.
purple hexagonal prisms, variety amethyst
a cut, purple (1.31ct) amethyst gemstone, hydrothermally grown.
a cut, blue (1.69ct) gemstone, hydrothermally grown.
black micaceous flattened massive, associated with white calcite
tabular to rectangular blocky, black with a hint of red highlights
deep orange to light orange, prismatic cluster of crystals, polytype 2h, associated with calcite, magnetite, pyrite and quintinite-3t, r070715
tufts of tan fibers associated with manganoneptunite, r130094, and orthoclase
bundles of green to white bladed crystals
type sample. unconsolidated steel-gray fragments associated with elongated zinkenite. this sample is primarily andorite vi mixed with andorite iv, as pointed out by donnay and donnay (1954).
massive, silver metallic associated with quartz and wurtzite
colorless to gray, associated with andradite, melilite and cuspidine (r140776).
radiating aggregate of thin bladed to acicular colorless to white crystals on iron oxide stained quartz crystals.
massive, orange anhedral grains exhibiting conchoidal fracture, co-type material
elongated, prismatic-to-tabular, pale yellow-to-colorless crystals, associated with chlorargyrite, emmonsite, ottoite, quartz, and jarosite.
colorless prismatic crystals, associated with chlorargyrite, emmonsite, ottoite, stolzite, scheelite, schieffelinite, quartz, and jarosite.
parallel aggregates of brownish-red fibers, associated with phlogopite, andradite, augite, pyrrhotite, magnetite, sulphur, and apatite.
lead-gray striated metallic crystals associated with dolomite. known as rathite i.
colorless bladed crystals associated with anglesite and galena, type sample. the crystals show fish-tail twin habit. type sample.
red incrustation with some prismatic crystals
pale brown translucent pseudo-octahedral crystals associated with blue vivianite and colorless triphylite
black acicular crystals intermixed with pale green micro-fibers, used in the foley et al (1997) can min 35, 1531-1534 study. associated with light purple clinochlore
massive, golden-brown veinlet; associated with chrysotile/serpentine
colorless single crystals and radial groups on wood
green spherical aggregates forming a coating on quartz
tan to pale yellow acicular, associated with albite, calcite, and analcime
reddish bronze metallic massive, associated with siderite.
loose aggregate of euhedral blue-green crystals
green grains in loose unconsolidated material
glassy green crystals on patronite, associated with r130365 minasragrite
radiating aggregates of colorless thin hexagonal plates.
dark gray metallic inclusion in sperrylite and os,ir,ru matrix. the sample is a polished fragment embedded in epoxy
pale red, tabular to blocky crystals associated with black langbanite r100037
steel gray metallic massive, associated with pirquitasite, r061016
colorless tabular crystals, associated with pale yellow-brown rmerite, white jokokuite (identifed only by raman), and colorless prismatic or acicular ferrinatrite (r170042)
transparent to translucent pink fragments in a gelatin capsule
platy blue crystals, with a 2-fold twin around [110]
brown plates. sample is from the same specimen used in the burns (1998) study.
transparent pale yellowish-green bladed crystal
brown transparent stubby prismatic single crystal associated with calcite
yellow transparent bladed crystals associated with yuanfuliite r100067 and black tabular hematite
pale green fibers from the co-type specimen
black to blue fibrous, known as blue asbestos
black prismatic crystals associated with titanite, r120030
colorless grains associated with kamacite, majorite and troilite, in a polished section embedded in epoxy
aggregate of coarsely crystalline yellowish-gray crystals associated with red eudialyte r050230
dark reddish brown plates on bobdownsite. this sample was used to determine the structure reported in andrade et al (2012)
dark red plates, associated with quartz and apatite
mass of randomly oriented silvery-gray striated prismatic crystals
dark reddish brown elongated prismatic crystals associated with jahnsite-(camnmg), r060213
radiating aggregate of black bladed crystals associated with pyrite
grass bladed crystals on quartz found with alunite
aggregates of grass-green to yellow-green stout crystals with good cleavage, associated with quartz and calcite
short prismatic hexagonal colorless to pale yellow crystals.
incrusted lustrous black crystals, reported to be fine-grained psuedomorphs of an unknown phase. co-type material.
yellowish-brown octahedra, associated with red piemontite, r060905. note that this is a fluorine rich phase.
brown octahedra associated with brizziite, r060611
orange color massive blebs associated with voltaite (r060237) and coquimbite (r060638).
reddish-brown isolated grains associated with copiapite, r060821
radiating, bladed to prismatic colorless crystals, type sample
green botryoidal crust associated with intergrown smithsonite
elongated, prismatic but curved, aqua blue crystals, associated with colorless hemimorphite and white granular smithsonite
reddish brown prismatic crystals associated with white albite. the color is a thin coating of something. based on cell parameters, we cannot exclude greifensteinite as the identification, without chemical analysis.
yellowish-brown spheroidal aggregates, associated with r130055 whiteite-(camnmg)
dark rose-pink elongated or thick tabular crystals, associated with quartz and calcite.
vitreous-opaque dark brown irregularly shaped masses intergrown with vitreous light brown childrenite and blocky dark blue scorzalite in a grayish siliceous matrix.
pale yellow thin hexagonal tablets associated with valentinite, clinocervantite, r070385 and tripuhyite, r070383
light pink striated prismatic crystals associated with quartz
light pink prismatic crystals associated with pollucite
green sharp thin plates, it should be noted that gerhardtite is dimorphous with rouaite and may be confused with it.
lime green, granular, associated with pale yellow acicular uranophane
yellow crystals, associated with calcite and colorless frolovite, r070469.
microscopic black-blue metallic massive associated with hematite, co-type sample
pale blue blocky crystals associated with green conichalcite, r070430, and pale blue granular barahonite-(al). this is the type sample.
pale-blue to white euhedral crystals, associated with light-pinkish mansfieldite, green conichalcite, and blue lavedulan
white fragment embedded in epoxy, co-type material
spherical aggregates of brown thin acicular radiating crystals, co-type material, associated with quartz, albite and muscovite
pale yellow granular, extracted by dissolving the matrix of sylvite/halite, associated with strontioginorite r110149, howlite r110150, volkovskite r110151, congolite r110153, and hilgardite
orange, massive and radial acicular crystals
brown prismatic crystals in radiating groups, with a globular gyrolite-like mineral, on and in hydroxyapophyllite-(k) with minor inesite.
pale yellow bladed crystals associated with orange wlsendorfite
a cut, pale yellow (1.50ct) gemstone, grown by flame fusion.
columnar aggregate of dark gray prismatic crystals, associated with quartz, orthoclase, liddicoatite and behierite
brown pseudohexagonal platy crystals on orthoclase
cluster of yellow plates, associated with r080027 bassetite.
unconsolidated aggregate of black to dark brown grains showing strong pleochroism
dark gray tarnished metallic prismatic crystals embedded in metalic spherules with native silver. crystal structure reported in yang et al (2008). this is the structure type sample.
steel gray elongated tablets arranged as sixling twins
dull white, semitransparent flat crystal associated with dolomite.
compact aggregate of very pale yellow grains with evident cleavage, associated with black hausmannite
lemon-yellow platy aggregates, associated with green metatorbernite
blue massive crust, associated with green atacamite
electric-blue platy crystals on limonitic matrix
blue bladed crystals in radial aggregates associated with elongated, forest-green libethenite and dark-green atacamite. this is the polymorph or polytype described in giester et al (2007)
deep red to black metallic elongated and striated prismatic crystals associated with quartz
golden brown, flattened, striated crystals associated with blue trolleite
orange colored blebs associated with white quartz, black braunite and brown parsettensite
pale yellow transparent cleavage fragment. crystal structure given below.
black blocky crystals, associated with elongated groutite, r070583
red tabular crystals associated with white wollastonite
rounded colorless crystals associated with orange gehlenite and black augite
brown, lamellar crystals with waxy luster, forming intergrowth with triphylite
colorless thin pseudohexagonal single crystals
yellowish-brown gemmy irregularly shaped coarse grains
parallel aggregates of metallic gray acicular crystals
aggregates of tabular colorless crystals, associated with grossular, calcite, and monticellite
dark red elongated prismatic crystals with good cleavage, associated with white prismatic valentinite crystals.
massive aggregate of parallel and radiating colorless needles intermixed with calcite, associated with tennantite and renierite
aggregate of silky hair-like crystals, associated with calcite, quartz, and germanite.  sample used in structure determination by origlieri & downs (2013).
golden brown pseudo-octahedral crystals, associated with yellow disc-like siderite.
dark brown vitreous dipyramidal crystal on white microcline matrix associated with pink tourmaline
colorless thin platy or scaly crystals, associated with clusters of acicular ottoite crystals.
pink bladed crystals, with epitactic serandite and calcite, type sample
pale yellow rosette associated with green emmonsite, r060802
black prismatic crystals in parallel aggregates associated with arseniosiderite, arsenolite, scorodite and karibibite on lollingite
aggregates of bright yellow micro crystals
lemon-yellow tabular to blocky crystals associated with orange-yellow fourmarierite (r100187) and soddyite
parallel aggregate of colorless bladed crystals, associated with jahnsite, r080072
black prismatic crystal associated with quartz and orthoclase
black massive, intimately associated with andradite
associated with noonkanbahnite, pyroxene and oxyphlogopite.
silvery fragments with slightly brassy luster, co-type specimen
scaly aggregate of pale green micaceous crystals
aggregate of yellowish-green platy crystals
bright yellow earthy druse associated with earthy red cinnabar
azure-blue, prismatic crystals. same sample as used by schindler and hawthorne (1999) for structure determination
coating of blue-green thin, tabular hexagonal crystals associated with gypsum, linarite, and serpierite
colorless prismatic crystals with obvious striations, associated with keyite, r050585, and zincolivenite, r050583
dirty yellow platy aggregates associated with reddish-brown pucherite
bright yellow/orange tabular crystals associated with blue diaboleite and colorless cerussite
group of blue prismatic to tabular crystals displaying many modifying forms
radiating group of colorless spear-head shaped prismatic crystals
colorless, elongated tabular crystals associated with aravaipaite r100032 and laurelite r100011
blue massive, associated with r120019 wesselsite and r120057 lavinskyite
dark blue granular or blocky crystals associated with light-blue platy lavinskyite (r141115) and blue wesselsite.
aggregates of granular crystals, associated with calcite and grey elongated tabular hedenbergite
dark reddish brown thin rectangular plates associated with black plattnerite, r080019, on the surface of a quartz crystal.
a mass of bright yellow platelets associated with colorless quartz
light yellow radiating acicular crystals, on a matrix of rockbridgeite and associated with leucophosphite (r080126)
colorless tetrahedral crystals, associated with talmessite, vladimirite, and apatite. type sample
grayish blue massive showing well-developed parting
striated silver-grey short prismatic crystals on matrix
black short prismatic crystals on galena associated with quartz and sphalerite
metallic grey tabular crystals, associated with fizelyite
black submetallic rounded grains on quartz with associated rutile
glassy coating over an altered stibnite crystal, mixed with cervantite
deep blue-green vitreous crystals with conchoidal fracture.
black, dark blue under strong light, polished gemstone
deep blue/purple fragment that almost appears black. twinned by a 2-fold rotation around (010), according to single crystal x-ray diffraction.
divergent sprays of blue bladed crystals associated with ktenasite, r090002
granular massive dark green to black, associated with vernadite, r080100
aggregates of bright red granular or prismatic crystals, associated with dark red platy arseniosiderite (r150061).
reddish crystalline massive in scorodite
bright silver metallic blebs in serpentinite, chonchoidal fracture
radial aggregates of pale blue fibrous crystals
reddish-brown micro grains in earthy matrix
colorless, vitreous, massive containing some black inclusions. sample fluoresces neon-orange under swuv light.
semi-transparent, dull-yellow to pale yellow coating
dark red to black mica associated with quartz, stilpnomelane and parsettensite
colorless prismatic crystal covered with thin white coating of adamsite-(y)
aggregates of brownish-gray fibrous prismatic crystals associated with uvarovite
group of yellowish brown flattened twinned crystals
grayish brown rhombohedral cleavage fragment
aggregates or individual blue, yellow-green, or olive green euhedral crystals
yellow-green to dark green (or blue) aggregates of sidwillite crystals, associated with white needles or long prismatic molybdite, and tiny bladed gypsum.
silver metallic octahedra coating chalcopyrite
steel gray cubo-octahedra associated with dark gray tetrahedrite (with parallel growth on corners), siderite and minor quartz
aggregates of royal blue smooth spheres associated with colorless variscite
tan colored cleavage fragment from a water worn pebble
mass of colorless parallel prismatic crystals
silver-white metallic wires with grey to bronze colored tarnished surface
silvery gold metallic blebs, associated with rhobohedral calcite and green prismatic malachite.
aggregates of colorless irregular crystals. note: quickly dissolves in acetone
colorless hexagonal tabular crystals, associated with blue platy crystals with chemistry cuzncl(oh)<sub>3</sub> (r140401). crystals are on a metallic mining artifact of copper composition.
radial aggregate of dark green micaceous crystals
subhedral off-white to pale yellowish gray crystal associated with spodumene, feldspar and quartz
green thin tabular square to rectangular crystals. crystals twinned by a 2-fold around [1 -1 0].
both dark brassy green and bright green platy crystals. crystals twinned by a 2-fold around [1 -1 0].
green platy crystals. crystal exhibits a 2-fold rotation twin around [1 -1 0].
pale yellow transparent faceted gemstone
cluster of acicular radiating colorless crystals
pale green to colorless acicular crystals
gray metallic, massive to coarsely crystalline
silver-grey metallic massive and radiating prismatic crystals
massive silver metallic associated with quartz
deep-red with good cleavage, associated with realgar and chabournite, r070371.
blue massive associated with brown burbankite r050646
yellow pyramidal crystals associated with light green malachite and dark green brochantite
white or colorless thin psuedohexagonal plates, co-type material
purple tabular fragment, used in the geiger & grodzicki (2012) study
twinned, pale yellow orthorhombic crystals
massive, lime-yellow crystals associated with anglesite, calcite and jarosite
deep bluish green doubly terminated and pyramidal crystals associated with quartz
white aggregate of parallel bladed crystals
loose aggregate of bright silver cubes, some with octahedral modifications
blue botryoidal aggregates forming coatings on the rock. sample is from f. spertini
steel gray crystal associated with franckeite r050431
red crystal in calcite, associated with yellowish-green clinohumite, r050183
black glassy fragment with conchoidal fracture
blue and red cut gemstones. the bottom red stone is the one that was studied.
a blue, cut (3.76ct) gemstone, grown by flame fusion.
massive red-orange/purple crystals; associated with yellow tellurite and quartz
dark brown grains, massive, associated with calcite. p-centered confirmed by x-ray diffraction.
bluish-black octahedron associated with fluorite and quartz. according to kissin & owens (1989), since 2a is significantly larger than c, this sample is stannite.
transparent brown blocky crystals on a white sodalite matrix. our sample is twinned. if we ignored the twin, then we get the reported hexagonal cell of moore and shen (1983).
mixture of orange chabazite and stellarite
sheaflike aggregates of white, tabular crystals
aggregate of reddish orange granular crystals in matrix of black hematite
dark gray metallic crystals associated with quartz
black fragment in quartz, associated with pyrargyrite. electron microscope image shows two fine-scale phases.
black sectile single crystals with good cleavage, some with purple iridescence, associated with stephanite.
colorless fine-grained, pseudomorph after pectolite
transparent yellow bladed crystals with orange laueite
tin-white reniform mass with many small inclusions of antimony
grey metallic platy fragment associated with arsenic
elongated sprays of green crystals on quartz
lead-gray prismatic crystals on matrix of senarmontite, sulphur and selenium
purple massive, associated with green serpentine
white to colorless sheaflike aggregates of flattened single crystals
red or green (depending upon light source) hexagonal prism associated with aegirine and orthoclase
dark orange crystalline blebs intergrown with fluorapatite
black platy radiating groups associated with quartz, 180 deg twin around [0 1 2]
aggregates of dark green plates, 180 deg twin around (-2 0 3) = [0 1 2].
spherical aggregate of colorless prismatic crystals
yellowish brown tetragonal dipyramidal crystals
colorless to light tan dipyramidal crystals
yellow to red gemmy crystals and fragments associated with chalcocite r120090, siderite and tennantite
white to colorless fibrous or hair-like aggregate
light green tufts on green platy chalcophyllite
radiating aggregates of bladed pale purple crystals
azure blue crust, there is no diffraction from this material
black metallic massive with conchoidal fracture
grey, metallic, pseudohexagonal flakes, conchoidal fracture
pearly white spheres or as radiating aggregates in vugs, associated with dawsonite and calcite
colorless elongated tetragonal prisms, extracted by dissolving the matrix of sylvite/halite, associated with howlite r110150, volkovskite r110151, ruitenbergite r110152, congolite r110153, and hilgardite
pale yellow tapering pseudotetragonal prisms
clusters of brown, elongate crystals, associated with clusters of purple sugilite, bronze fibrous potassic-magnesioarfvedsonite, and dark red-brown lipuite
colorless with a brown tint, cleavage fragment
black, highly reflective, chonchoidal fracture, blebs scattered throughout the matrix, associated with altaite, r060692
fibrous spheres and layer of purple color, associated with dark-red lipuite (r140946).
brassy metallic massive with black tarnished surfaces
sprays of black acicular crystals with iridescent blue highlights
spherical aggregates of white to transparent waxy platy crystals associated with yellow mimetite
reddish-brown fibrous or platy crystals in parallel or radiating groups
array of colorless tabular hexagonal plates
isolated aggregates of bright-green granular or flake crystals, associated with pale grey walstromite (r150079), pellyite (r150078), diopside, benitoite, bavsiite (r150042) and celsian
white prismatic hexagonal crystals associated with reddish brown andradite, r060326
orange-brown crystals embedded in a matrix of pyrophyllite, quartz and kyanite
colorless glassy fragment in center of the photo
gunmetal dark grey with brownish tint; massive curled and folded sheets associated with quartz
columnar light yellow metallic crystals associated with quartz
aggregate of black bladed crystals,  2-fold twin around [1 -1 0]
dark green thick blades, 2-fold twin around [1 -1 0]
black psuedo-octahedral with cube modifications
yellowish-orange prismatic crystals associated with albite, quartz, hematite and muscovite
brownish-red earthy blebs associated with quartz and magnetite
pink massive, associated with rhodochrosite.
matted aggregates of white fibrous crystals, associated with magnetite and chromite
green elongated crystals, associated with blue azurite, pale green thick tabular powellite (r100180) and colorless granular prosopite (r100181).
pulverulent colorless to pale yellow efflorescent grains. larger colorless grain with scalloped surface was examined.
colorless saddle-shaped crystals associated with austinite
aggregates of reddish orange platy crystals associated with reddish purple erythrite
bronze metallic massive, associated with cubanite. we can not tell the difference between them by eye.
colorless thin tabular crystals associated with yellow sulfur and colorless potassium alum
aggregates of bright green prismatic crystals associated with calcite and malachite
aggregates of radiating acicular  brown crystals, associated with pink sugilite and dark-red lipuite. type sample.
submetallic dark grey fragments with parallel cleavage planes
black tabular crystal associated with white albite and colorless quartz
pale yellow or pale blue to clear bladed crystals.
black to dark red on thin fragments, euhedral prismatic crystal
reddish brown blocky crystals frozen in quartz
red-brownish crystals in cavity, associated with  itsiite, cerchiaraite-(fe), diopside, pyrite, quartz, sphalerite, and witherite
faceted colorless stone, cell parameters indicate a disordered structure
bright greenish-yellow vitreous crystals, associated with colorless triphylite, pale yellow hureaulite, and dark blue barbosalite.
druse of pale yellowish-green crystals, associated with giniite (r060765), triphylite, heterosite, and hureaulite.
grayish black massive aggregate of thin folia with warped and bent crystals
blue prismatic, associated with graemite, r100207, and cuprite
orange acicular crystals filling a fracture
colorless massive crystalline, associated with quartz and tellurium
bright silver sectile metallic plates associated with yellow gold
black metallic tetrahedral crystals associated with pinkish grey famatinite, r110022, on pyrite
grey-black crystals associated with white quartz. the crystals appear to vary in chemistry between tennantite and tetrahedrite.
black massive with some prismatic faces, associated with malachite and chrysocolla. sample is a pseudomorph.
dark red crystals, some are triply twinned, platy ones are doubly twinned, and elongated prismatic crystals are untwinned.
tan colored massive, associated with reddish zincite and metallic franklinite.
translucent gray massives, associated with reddish zincite and metallic franklinite.
dark orange bladed crystals on lighter orange incrustation, both terlinguacreekite, associated with calcite
pale green colored mass showing perfect cleavage
yellow crystals, associated with red montroydite (r140877)
green massive, associated with black-brown jasmundite, small black grains of srebodolskite, hydroxylellestadite, ettringite and portlandite.
lath-shaped black crystals with striations parallel to the c-axis. associated with barite, quartz, pyrite, gustavite, and tetrahedrite.
aggregate of grey crystals with a dull surface but bright silver grey on fresh cleavage
black tetrahedra associated with quartz and pyrite
lead-gray massive in a polished slab, associated with pyrite and quartz
metallic gray massive, associated with gustavite, r100203
mass of colorless acicular crystals associated with afwillite, r080022
green botryoidal aggregates coating magnetite
aggregate of sharp yellow blocky crystals
colorless prismatic rectangular single crystals associated with colorless ralstonite
pinkish-gray spearhead shaped crystals associated with albite and hexagonal tablets of clinochlore
tan colored long prismatic crystals embedded in purple charoite r060376
clay-like white fine-grained massive, associated with jarosite, from type find
parallel aggregates of lead-gray bladed crystals associated with quartz, pyrite, magnetite, and tetrahedrite. co-type sample
cut slab of malachite-stained weathered quartz containing massive lead-grey veinlets. co-type material.
aggregate of yellowish orange prismatic crystals associated with quartz
parallel aggregates of orange platy crystals
black crystal fragments embedded in beryl and associated with muscovite
brown colored subhedral blebs associated with quartz, diopside and sanbornite
black grains associated with pink gillespite and quartz
dark gray metallic crystal embedded in epoxy
black bleb associated with titanite, sanidine and tetrahedrite; opaque under microscope
white portion of a zoned watermelon tourmaline slice, see also r060566 (pink) and r070564 (green)
green gemmy fragments, consistent with dravite
green acicular crystals associated with quartz, supposed to be the new mineral luinaite
sprays of green parallel acicular crystals
masses of green acicular crystals associated with quartz
brownish-red granular associated with sanbornite
single dark red crystal, associated with jordanite and binnite
group of pale blue parallel acicular crystals
white radiating tufts of acicular crystals
aggregate of pinkish prismatic crystals with good cleavage
black octahedral crystals embedded in fine green nepouite matrix
black octahedral crystals, associated with r150037 euhedral vitreous green liebenbergite.
colorless thin hexagonal plates. masami kanzaki (okayama university) suggests this is polytype tridymite po-10.
colorless micro-crystal, as an inclusion in olivine. masami kanzaki (okayama university) suggests this is polytype tridymite mc.
imbedded in a polished slab, associated with kamacite, taenite, troilite, and schreibersite. masami kanzaki (okayama university) suggests this is polytype tridymite mc.
microcrystalline massive, no visible indication of foliation, polytype 1m
aggregate of coarse purple crystals associated with elbaite, r060003
bluish gray massive associated with brown zwieselite r050279
transparent grey greenish acicular crystals associated with valentinite, clinocervantite r070385, and rosiaite r070384
aggregate of orange coarse amorphous fragments
dark gray to tarnished brown metallic grains found in a chondrite meteorite class l4, that fell on march 12, 1899
fine grained massive, brownish-gray with metallic luster
colorless to light blue massive fragment, 2-fold twin around [1 0 2]
aggregate of pale yellowish brown flattened crystals
colorless single crystals with octahedral and cubic forms
colorless steep dipyramidal tetragonal crystals
groups of tan colored parallel prismatic crystals associated with eudialyte and arfvedsonite
subparallel pale tan prismatic crystals with vitreous luster
aggregate of yellowish-orange bladed crystals with significant chemical oscillations, associated with green duftite
brilliant brown wedge-shaped crystals on pulverant segnitite, associated with colorless mimetite
sea blue tabular crystals on quartz associated with yellowish phosphohedyphane, goethite, hematite, cerussite, fluorite, and corkite.
teal-green micro-crystals, massive, associated with quartz
pale green platy crystals, associated with galena and tennantite
aggregates of metallic grey platelets associated with orange grossular
black unconsolidated powder, representing a mixture with a mo-oxide.
pink fine-grained aggregate associated with albite
aggregates of small transparent colorless grains
fragment of a colorless vitreous crystal, co-type material. associated with minor calcite
brown elongated bladed crystals associated with white orthoclase and black amphibole
colorless rhombohedron with defined cleavage
gray metallic massive, x-ray diffraction shows this to be the 3r polytype. intimately associated with galena
group of reddish brown radiating acicular crystals
divergent group of brown rectangular prisms
colorless to grayish white massive that fluoresces bright orange under sw uv.
black submetallic with internal red hints, no distinct crystal forms
pale blue foliated coating, tyrolite-2m polytype
greenish-blue flat bladed crystals in radial aggregates
thin platy lemon yellow crystals associated with green tangeite
yellow platy crystals and veinlets on calcite
steel gray metallic massive associated with rhodochrosite
bright silver metallic massive, associated with quartz
radiating aggregates of light green acicular crystals associated with quartz
metallic dark blue to black blebs underneath green glassy material
radiating aggregates of gray-white matted fibers associated with quartz
brownish green cleavage fragment, co-type material
elongated dodecahedral gray-black submetallic crystals
sprays and aggregates of pale yellow fibers
yellow elongated prismatic crystals in aggregates with muscovite on albite
yellow prismatic crystals on albite, associated with a yellow fibrous unknown mineral
cluster of light green crystals embedded in epoxy, co-type material
radial aggregate of pale brownish yellow bladed crystals, associated with radial aggregate of pale green atencioite, dark green rockbridgeite, and lefontite r140074
blue acicular crystals found as isolated crystals, or as sprays, associated with quartz and greenish dugganite
yellow prismatic crystals associated with isolated red crystals of realgar
metallic black micro-octahedra in massive aggregates associated with pyrite
colorless prismatic single crystals, adamantine luster, associated with pyrite and black metallic, elongated jamesonite.
radial spray of pale yellow and colorless bladed crystals
bronze-yellow metallic massive associated with calcite
yellow brown fibrous, associated with quartz crystals on matrix
aggregates of dark-green bladed crystals
yellowish-orange blocky crystals associated with dark reddish-orange fourmarierite
indistinct green crystals forming a glassy crust
green blocky, combination of pseudo-octahedral and pseudo-cubes on quartz
red blocky crystals on a matrix of white albite
brown massive. can't find good single crystals for identification (too fine).
black metallic bleb; mounted on microprobe plastic
pink transparent gemmy massive associated with cerite-(ce) r060708
black wedge-shaped crystals, dark-green in thin crystal fragments, associated with yellowish-brown fine-grains and darker reddish-orange prismatic crocoite.
aggregates of pale blue tabular crystals
transparent white fibrous and platy mass
steel gray metallic massive with red internal reflections, associated with boulangerite, reddish-brown sphalerite, and calcite
dark green prismatic, co-type material, associated with apple green euchlorine
black rounded or globular micro grains, associated with serrabrancaite, r080077
olive green druse of platy crystals, some with pseudohexagonal outlines, associated with malachite
violet prismatic crystals on diopside, r060171
purple equant, doubly terminated prismatic single crystals.
aggregate of gray prismatic crystals associated with calcite
blue prismatic crystals associated with pyromorphite and quartz
blue single crystals scattered in matrix
brown transparent crystals associated with black tochilinite, strontianite, and dolomite
yellow granular massive associated with malachite
yellow gemmy fragments associated with rhodonite. portion of type sample.
green prismatic and elongated single crystal
bluish green elongated prismatic crystals
group of dark blue elongated prismatic single crystals in a fossilized clam shell
platy, indigo-blue massive, associated with maricite
parallel aggregate of colorless thin prisms.
sprays of elongated bladed colorless crystals
colorless vitreous massive, rarely in irregular plates associated with calcite
green rosettelike aggregate of hexagonal scaly crystals
clusters of olive to yellowish green pseudohexagonal crystals
parallel aggregate of dark green tabular crystals associated with malachite
pale red platy crystals, extracted by dissolving the matrix of sylvite/halite, associated with strontioginorite r110149, howlite r110150, ruitenbergite r110152, congolite r110153, and hilgardite
dark blue modified octahedra associated with romerite (r060238) and coquimbite (r060638)
light yellow platy crystal, embedded in microcline.
cream colored platy massive associated with pinkish ussingite, light yellow-green sphalerite, and brown elongated tabular serandite
yellow scale of platy crystals associated with microcline, pale pink elogated serandite, natrolite, and light brown platy manaksite.
light tan, compact mass of micro-crystals associated with calcite and greenish sodalite
tan colored water worn prismatic crystals, associated with fluorapatite
colorless grains, associated with anhydrite and boracite, embedded in halite. halite is dissolved in water.
pale yellow lamellar fragments, associated with isokite, r070526.
reddish-brown granular aggregate, variety magniotriplite, polytype wagnerite-ma5bc
pale orange fragments, intimately associated with panasqueiraite
pale pink massive, portion of the original find
white massive, associated with prehnite and dmisteinbergite, r130087
yellow braded or fibrous crystals, associated with black metallic chabournite with conchoidal fracture (r140106), red realgar, and colorless massive or tabular celestine.
blue-gray to rust-brown colored prismatic crystals
yellow thin tabular crystals associated with metazeunerite, r060301
colorless massive with pronounced cleavage, strong orange-pink fluorescence under long-wave ultraviolet light
colorless granular or short prismatic crystals with good cleavage, associated with suzukiite (r150039), pellyite (r150078), and bavsiite.
transparent yellow flattened striated crystal fragments
black prismatic crystals embedded in matrix
black metallic crystals associated with red cinnabar, white quartz, silver balls of liquid mercury. crystals are twinned by a 2-fold rotation around [100].
radial aggregate of colorless acicular crystals
colorless to pale brown crystals, associated with prismatic dark brown or bluish fluor-dravite
white to colorless spheroidal crystals found in the pith of a living saguaro cactus
yellowish green flattened plates, associated with reddish-orange carnotite, r070647. sample was used in the fejfarova et al (2012) study.
druse of dark pink elongated pyramidal crystals
red crystals associated with colorless calcite
red vitreous crystals. photo from wendell wilson
red fragments. photo from wendell wilson
red vitreous mineral. photo from wendell wilson
dark blue massive, associated with r120057 lavinskyite and r120077 scottyite
metallic silver massive, associated with elongated dark-green diopside.
aggregates of parallel pale blue thin bladed crystals, associated with blue to dark blue tabular antipinite
light-blue thin, flat bladed fibers associated with colorless hydroxyapophyllite, blue kinoite, and light yellow andradite.
pale green granular, associated with blue diaboleite
pale green acicular crystals, associated with blue diaboleite
colorless to pale yellow blocky hexagonal crystals, associated with r130054, roscherite
light tan with triangular striated faces, associated with deep red roscherite and colorless acicular sprays of tiptopite. crystals are twinned by a 2-fold rotation around a*.
colorless granular massive, and as rhombohedra in cavities, associated with white rice-shaped fluorapatite, and colorless quartz. type sample.
radial sprays of brown prismatic crystals associated with jahnsite, childrenite, and quartz
colorless flattened tabular hexagonal prisms
compact aggregate of very dark green to black prismatic crystals with pale yellow satterlyite in a nodule
spherical aggregates of tan to colorless acicular crystals
pale tan colored transparent pseudohexagonal crystals
colorless dodecahedra on mica, type sample
dark green bladed crystal, vug has large xl with parasymplessite xls, smaller xl removed from this larger one
black anhedral grains found as inclusions within colorless anorthoclase
parallel aggregate of colorless acicular crystals
colorless tabular crystals forming a spherical aggregate
matted group of tan colored bladed crystals, associated with ferriwinchite
dark green prismatic crystals frozen in a matrix of calcite and mica
light brown prismatic to needles, associated with black hausmannite and white barite
black blocky crystals in white microcline
yellowish-brown fragment frozen in matrix
reddish brown, vitreous, bladed crystalline aggregates in parallel growth with dark brown triplite and bluish vivianite.
2m polytype. colorless parallel acicular crystals
massive aggregate of colorless parallel acicular crystals
colorless platy, frozen in matrix, polytype 2m, associated with perovskite r120121, spurrite and gehlenite
a crust of orange blocky crystals.  sample is from the specimen used in the burns (1999) study. associated with rutherfordine.
colorless cubes, with striations that display the rhombohedral symmetry
pale blue granular coating on bull quartz
pale green equant rhombic-dipyramidal crystals, co-type sample
pale pink acicular crystals in a random and loose aggregate
dark-brown hexagonal prisms, polytype 2h
reddish brown blocky crystals, polytype wurtzite-4h
elongated and striated platy translucent black crystals. this is the material known as the dehydrated phase of wyartite, sometimes known as wyartite ii (hawthorne et al, 2006)
light brown to yellow bladed crystals, associated with red prismatic proustite
brown to orange tabular crystals, in groups and singles, associated with red elongated prisms of proustite
colorless to pale brown bladed crystals associated with black massive melanotekite, r090032, and brown rhodochrosite. sample is from the john innes collection. type sample.
orange-brown thin fibers associated with albite
brown tabular crystals associated with katophorite, r050633.
a cut, green (2.71ct) gemstone, grown by crystal pulling
brown glassy amorphous, note that a fragment of this sample was heated and is posted at r080046
brown glassy from amorphous sample r060022 after heating at t = 850 c for 18 hours
sprays of red needles associated with black tabular hematite, colorless plates of sanidine, and yellow bladed crystals of an amphibole r100069, possibly richterite
group of colorless flat tabular crystals
aggregate of tan colored thin lamellae formed from parallel fibers
aggregates of light brownish acicular crystals, associated with blue granular meieranite (r140947), colorless hydroxymcglassonite-(k), massive pale green sugilite, prismatic grey aegirine and bladed white pectolite. cotype sample.
matted aggregates of pale blue-green microscopic fibers
mass of pale green acicular crystals associated with eosphorite
pale lilac rectangular blocky crystals on muscovite
green amorphous crust, intimately associated with nepouite
pale pink to colorless hexagonal prismatic crystal fragments
aggregates of pale yellow fibers associated with yellow liebigite
spherical aggregates of white platy crystals
dark green massive, lighter green when thin, associated with quartz.
dark green massive in veinlets, associated with beusite and lithiophilite. type sample
white granular massive, co-type material
dark brown to black poorly-formed grains scattered over white efflorescent material, co-type material, associated with well-formed crystals of fingerite, r070614
single brownish yellow grain; holotype specimen
grey, metallic crystal with irregular, platy structure
deep red crystal associated with calcite
irregular bright blue-green crystals, associated with colorless, prismatic hemimorphite.
green crystals associated with keyite, r050585, and schultenite, r050584
colorless, lathlike, elongated and striated, associated with tennantite ore. a piece of the co-type specimen from john innes
lead-gray metallic foliated fragment intimately associated with stibnite
brownish red prismatic crystal frozen in matrix, associated with apatite
colorless single waterworn euhedral crystal
yellowish orange grains in albite-aegirine-nepheline matrix
groups of pale pink transparent acicular crystals
light gray crystals showing combined octahedral and tetrahedral forms
aggregate of pale green tabular crystals
brown massive associated with bluish-gray triphylite r050366
very small acicular crystals forming a coating of tan colored nodules
pale green tabular crystals lining fractured rock
pale-yellow crystals up to 0.15 mm in length, associated with bismuthinite, adranosite, brontesite, demicheleite-(br), demicheleite-(cl), and panichiite. data from demartin et al (2012).
steel gray with a red hint, mass of poorly formed crystals
black cube modified with octahedral corners
aggregate of silvery white metallic cylindrical tubes
green aggregate of acicular crystals forming round wheel-like shapes, intimately mixed with mimetite
aggregate of tan colored parallel fibers
a group of gray-black thickly acicular crystals
aggregate of blackish-gray elongated crystals
dark red flakes. the cell parameters indicate that this is pearceite-m2a2b2c
flakes brown or pale golden brown, with a colorless to very pale yellow streak and a vitreous to pearly lustre. associated with astrophyllite, zinc pyrophanite, columbite-(mn) and quartz. data from stepanov et al (2012)
dark blue to ink-blue, non-uniform and spotty, massive. associated with lazurite, calcite, afganite, tounkite, phlogopite and marialite. data from sapozhnikov et al (2011)
bundesamt fr seeschiffahrt und hydrographie
monofilament (nylon 6 and 6,6 copolymer)