American Mineralogist's Image Gallery

Florenskyite: (Fe,Ni)TiP

Comments: Backscattered electron image of the serpentine mass containing bright florenskyite grains (arrow). (AmMin, 85:1083).
Location: Kaidun chondritic meteorite, which fell in South Yemen in 1980. Scale: See Image.
© American Mineralogist

Footemineite: Ca2Mn++Mn++2Mn++2Be4(PO4)6(OH)4·6H2O

Comments: Yellow, barrel-shaped, prismatic footemineite crystal (AmMin v93:2.
Location: Foote Lithium Co. Mine (Foote Mine), Kings Mountain District, Cleveland Co., North Carolina, U.S.A. Scale: Crystal size 0.8 mm.
© American Mineralogist

Fraipontite: (Zn,Al)3(Si,Al)2O5(OH)4  
Zaccagnaite: Zn4Al2(OH)12(CO3)·3(H2O)

Comments: Scanning electron microscope image of hexagonal, tapering, prismatic zaccagnaite crystals, covered by a thin crust of fraipontite. (AmMin 86:1294).
Location: Marble quarries of the Carrara basin (Apuan Alps, Italy). Scale: See Image.
© American Mineralogist

Frankdicksonite: BaF2

Comments: Cubic crystals of frankdicksonite. AmMin v59:885.
Location: Carlin gold deposit, Eureka County, Nevada, USA. Scale: See Image.
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Fuenzalidaite: K6(Na,K)4Na6Mg10(SO4)12(IO3)12·12(H2O)

Comments: SEM image of hexagonal (trigonal) crystals of fuenzalidaite. (AmMin, v79:1003).
Location: Nitrate mine about I km south of the former plant site of Oficina Santa Luisa, northern Chile. Scale: Scale Bar 10 µm.
© American Mineralogist

Gahnite: ZnAl2O4

Comments: Optical micrograph of gahnite (blue) + Na-Ca-Li mica pseudomorph after staurolite in calcite matrix pigmented with brownish Fe-(hydr)oxide. (AmMin, 88:794).
Location: Diaspore-bearing metabauxite from East Samos (Greece). Scale: See Image.
© American Mineralogist

Ganophyllite: (K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7·8-9(H2O)

Comments: SEM image of a ganophyllite crystal. (AmMin, 88:1325).
Location: Molinello Mine, Val Graveglia, Italy. Scale: Scale bar 100 µ-m.
© American Mineralogist

Ganterite: [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2

Comments: BSE image of thin-section showing ganterite (G) portion of a larger muscovite (M) grain. The lighter color corresponds to greater heavy element (Ba) contents. AmMin, v92, p703.
Location: Lincoln Hill dumortierite deposit in the Humboldt Range located near Oreana, Pershing County, Nevada. Scale: Picture size 300 µm.
© American Mineralogist

George-ericksenite: Na6CaMg(IO3)6(CrO4)2·12(H2O)

Comments: Scanning electron microscope (SEM) photomicrograph of part of a georgeericksenite aggregate: note the cracking of the crystals due to H2O loss under the SEM vacuum. (AmMin 83:391).
Location: Museum specimen labeled as originating from Oficina Chacabuco, Chile.. Scale: See Image.
© American Mineralogist

Glushinskite: Mg(C2O4)·2(H2O)

Comments: SEM photo of two large euhedral glushinskite crystals partially embedded in the dried, rotten saguaro matrix. (AmMin, 88:1883).
Location: Crystals associated with the remains of a saguaro, Carnegiea gigantea from south and west central Arizona. Scale: Scale bar 150 µ-m.
© American Mineralogist

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

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

Haggertyite: Ba[Fe++6Ti5Mg]O19

Comments: Backscattered electron photomicrograph showing a hexagonal haggertyite crystal (white) in contact with richterite (light gray) and serpentized olivine (dark gray). (AmMin, v 83, p 1324).
Location: Prairie Creek lamproite, Arkansas, USA. Scale: See Image.
© American Mineralogist

Hashemite: Ba(Cr,S)O4

Comments: Scanning electron micrograph of a hashemite crystal with common faces labeled. AmMin v68:1223.
Location: Discovered in specimens from building stone quarries, 60 km southeast of Amman, in west-central Jordan. Scale: Picture Size 100 µm.
© American Mineralogist

Hawthorneite: Ba[Ti3Cr4Fe4Mg]O19

Comments: Replacement-textured magnesian chromian spinel (dark gray, CHR) infiltrated by hawthorneite (H, medium gray). B&W polished section, PPL with oil immersion. (AmMin, v74:668).
Location: Metasomatized, harzburgitic xenolith from a diamondiferous kimberlite pipe in Kimberley, South Africa. Scale: See Image.
© American Mineralogist

Haycockite: Cu4Fe5S8  
Mooihoekite: Cu9Fe9S16

Comments: B&W polished section image of mooihoekite-haycockite intergrowth showing tarnished mooihoekite (mh) and haycockite (hc). The small whitest lamellar grains are mackinawite.
Location: Hortonolite dunite (replacement,) pegmatite, Mooihoek Farm, Lydenburg District, Transvaal, South Africa. (AmMin, v57:689). Scale: See Image.
© American Mineralogist

Hyttsjoite: Pb18Ba2Ca5Mn++2Fe+++2Si30O90Cl·6(H2O)

Comments: B&W image of hyttsjoite (Hy) with quartz (Q), melanotekite (M), andradite (A), and a mixture of a mineral resembling talc with unidentified phases (T).
Location: Langban mines, Filipstad district, Varmland, Sweden (AmMin, v81:743). Scale: See Image.
© American Mineralogist

Ikunolite: Bi4(S,Se)3

Comments: B&W polished section showing kunolite( ik) in association with bismuth bi) and bismuthinite (bt). (AmMin, v47:1431).
Location: Bismuth-molybdenite pipes at Kingsgate in the New England district of New South Wales, Australia. Scale: 150 X.
© American Mineralogist

Indialite: Mg2Al4Si5O18

Comments: SEM images of indialite clusters. (AmMin, 89:3).
Location: Somma-Vesuvius volcano in unusual pyrometamorphic ejecta. Scale: Scale bar 100 µ-m.
© American Mineralogist

Jarosewichite: Mn++3Mn+++(AsO4)(OH)6  
Flinkite:

Comments: Radial divergent spray of thick prismatic jarosewichite crystals with bladed flinkite crystals. (AmMin, v67:1043).
Location: Franklin mine, Franklin, SussexC ounty, New Jersey, USA. Scale: Scale Bar 100 µm.
© American Mineralogist

Joelbruggerite: Pb3Zn3Sb+++++As2O13(OH)  
Mimetite: Pb5(AsO4)3Cl

Comments: SEM image of a barrel-shaped joëlbruggerite crystal lanced by acicular mimetite. (AmMin, v94:1012).
Location: Black Pine mine, 14.5 km northwest of Philipsburg, Granite County, Montana, USA. Scale: Crystal Size 30 µm across.
© American Mineralogist