American Mineralogist's Image Gallery

Boralsilite: Al16B6Si2O27  
Grandidierite: (Mg,Fe++)Al3(BO4)(SiO4)O

Comments: B&W PPL image of aggregates of boralsilite in quartz near grandidierite. Pyrite is partially replaced by oxide. Abbrev: A+B = Secondary andalusite, B = boralsilite, G = grandidierite, P = pyrite, Q = quartz. (AmMin v93:294).
Location: Pegmatites from the Larsemann Hills, East Antarctica. Scale: See Image.
© American Mineralogist

Borocookeite: Li(1+3x)Al(4-x)(BSi3)O10(OH,F)8 [x = 0-0.33]

Comments: Black and white image of multicolored tourmaline crystals (1) in fine-flaky aggregate of borocookeite (2). (AmMin, v 88, p 831).
Location: Sosedka and Mokhovaya pegmatite veins, Malkhan gem tourmaline deposit, Chikoy district, Chita oblast, Russia. Scale: Sample size is 5 x 5 cm.
© American Mineralogist

Bouazzerite: Bi6(Mg,Co)11Fe14[AsO4]18O12(OH)4(H2O)86

Comments: SEM image of prismatic bouazzerite crystals associated with botryoidal powellite and minute cubic crystals of alumopharmacosiderite.
Location: From the "Filon 7" (French for Vein 7) through "Puits 1" (shaft 1), Bou Azzer mine, Anti-Atlas, Morocco.. Scale: See Image.
© American Mineralogist

Calderonite: Pb2Fe+++(VO4)2(OH)

Comments: Secondary electron image showing a cluster of prismatic calderonite crystals. (AmMin, 88:1704).
Location: Santa Marta, Badajoz province, Spain. Scale: See Image.
© American Mineralogist

Carlinite: Tl2S

Comments: B&W image of carlinite fragments (opaque grains), with some quartz (transparent gralns. (AmMin, v60:559).
Location: Carbonaceous limestones exposed in the east pit of ihe Carlin mine, Nevada, USA. Scale: See Image.
© American Mineralogist

Carlosruizite: K6(Na,K)4Na6Mg10(Se++++++O4)12(IO3)12·12(H2O)

Comments: Trigonal crystal of carlosruizite. (AmMin, v79:1003).
Location: Platy crystals in samples of iquiqueite obtained by leaching caliche amarillo (yellow nitrate ore) from samples in the Iquique office of the former Servicio de Minas del Estado of Chile. Scale: Scale Bar 10 µm.
© American Mineralogist

Carmichaelite: (Ti,Cr,Fe)[O2-x(OH)x],x~0.5

Comments: Backscattered electron (BSE) image of a grain of carmichaelite included in pyrope in GRPy-40. (AmMin 85:794).
Location: Garnet Ridge, an ultramafic diatreme on the Colorado Plateau in Arizona.. Scale: See Image.
© American Mineralogist

Carraraite: Ca3Ge(OH)6(SO4)(CO3 )·12H2 O

Comments: Scanning electron microscope image of tabular, hexagonal carraraite crystals. (AmMin 86:1294).
Location: Marble quarries of the Carrara basin (Apuan Alps, Italy). Scale: See Image.
© American Mineralogist

Caswellsilverite: NaCrS2

Comments: B&W PPL image showing anhedral grain of caswellsilverite (Cw) associated with daubrdelite (Db), ferromagnesian alabandite (Ab) and kamacite (Km), containing perryite (Pr), as well as enstatite (En).
Location: Norton County enstatite achondrite meteorite. (AmMin, v67:132). Scale: Scale Bar 0.1 mm.
© American Mineralogist

Caswellsilverite: NaCrS2  
Schollhornite: Na0.3CrS2·(H2O)  
Daubreelite: Fe++Cr2S4

Comments: Polished section (PPL) of schiillhornite (Sh), coexisting with caswellsilverite (Cw), ferromagnesian alabandite (Ab) and daubreelite (Db). (AmMin, v70:638).
Location: Norton County (Kansas-Nebraska) enstatite achondrite meteorite. Scale: Scale bar is 0.08 mm.
© American Mineralogist

Changbaiite: PbNb2O6

Comments: BSE image of a zircon grain with inclusions of bastnasite? (bs), columbite (cb), cerofluorite (ce), chanbaiite (ch), cryolite (cry), thorite (th), xenotime (xe) and niobium-rich iron oxides (Nb-Fea).
Location: Rhyolite laccoliths from the Sierra Blanca Peaks, Trans-Peco region, Texas. (AmMin, v 74:865). Scale: See Image.
© American Mineralogist

Chivruaiite: Ca4(Ti,Nb)5[(Si6O17)2[(OH,O)5]·13-14H2O

Comments: SEM image of radiating aggregate of chivruaiite from a microcline vein in eudialyte-bearing lujavrite. (AmMin, v91, p923).
Location: Chivruai River valley, the Lovozero massif, Khibiny massif, Kola peninsula, Russia. Scale: See Image.
© American Mineralogist

Chladniite: Na2Ca(Mg,Fe++)7(PO4)6

Comments: B&W reflected light image of chladniite (Ch). Silicates are olivine (Ol), pyroxene (Px), and plagioclase (Pl). Chlorapatite (Ca). Schreibersite (Sc) and Fe,Ni metal (M) encloses the entire assemblage.
Location: Carlton (IIICD) iron meteorite. (AmMin, v79:375). Scale: Scale Bar 200 µm.
© American Mineralogist

Cianciulliite: Mn++++(Mg,Mn++)2Zn2(OH)10·2-4(H2O)

Comments: SEM image of a typical cianciulliite crystals. The abundant incipient cleavage is very obvious. (AmMin, v76:1708).
Location: Franklin, New Jersey, USA. Scale: Field of view is 0.3 mm.
© American Mineralogist

Clinozoisite-(Sr): CaSrAl3(Si2O7)(SiO4)O(OH)

Comments: Boulder consisting of prehenite, diaspore, chlorite and niigataite. The pale lavender is prehenite/diaspore and the very pale green is chlorite/niigataite..
Location: Itoigawa, river Kazuo, Niigata prefecture, Japan. Scale: Specimen size 19cm x 16 cm.
© American Mineralogist

Clinozoisite-(Sr): CaSrAl3(Si2O7)(SiO4)O(OH)

Comments: Backscatter electronic image of niigataite (bright) which is partially replacing a chlorite (med gray) grain in a diaspore (dark gray, rod-shaped) and prehenite (light gray) matrix.
Location: Itoigawa, river Kazuo, Niigata prefecture, Japan. Scale: Picture size 5 mm.
© American Mineralogist

Coquimbite: Fe+++2(SO4)3·9(H2O)

Comments: Coquimbite rosettes (small bumps) secondarily nucleated on a cryptocrystalline mass. AmMin, v90, p1734.
Location: Vents associated with underground coal fires in the Wuda coal bed of Inner Mongolia. Scale: See Image.
© American Mineralogist

Corderoite: Hg3S2Cl2  
Radtkeite: Hg3S2ClI

Comments: SEM image of prismatic radtkeite crystals and equant corderoite crystals on quartz matrix. AmMin, v76:1715).
Location: McDermitt mercury mine, Humboldt County, Nevada, USA. Scale: Scale Bar 10 µm.
© American Mineralogist

Costibite: CoSbS

Comments: B&W polished section image of ullmannite-willyamite zoned crystal (Ul-Wi) surrounded by lollingite (Lol) containing lamellae of costibite (Co) in a siderite (Sid) matrix. AmMin v55:10.
Location: Consols Mine, Broken Hill, New South Wales, Australia. Scale: See Image.
© American Mineralogist

Coulsonite: Fe++V+++2O4

Comments: Evenly disseminated fine-grained coulsonite in subhedral crystals (light gray) scattered through silicate gangue (dark gray), composed of chlorite, muscovite and scapolite. (AmMin, v47:1284).
Location: Metamorphosed igneous rocks of the Buena Vista Hills located some twenty miles southeast of the town of Lovelock, Nevada, USA. Scale: Picture Size 135 x.
© American Mineralogist