American Mineralogist's Image Gallery

Dumortierite: Al6.5-7(BO3)(SiO4)3(O,OH)3

Comments: Low-magnification, bright-field image showing dispersed dumortierite fibers extracted from rose quartz on a carbon film. (AmMin 87:270).
Location: Madagascar. Scale: See Image.
© American Mineralogist

Dumortierite: Al6.5-7(BO3)(SiO4)3(O,OH)3

Comments: Low-magnification, bright-field image showing dispersed dumortierite fibers extracted from rose quartz on a carbon film. (AmMin 87:270).
Location: Madagascar. Scale: See Image.
© American Mineralogist

Ellisite: Tl3AsS3

Comments: SEM image of ellisite grains showing rhombohedral cleavage fragments. (AmMin, v64,701).
Location: Mineralized laminated carbonaceous dolomite beds in the Carlin gold deposit, Eureka County, Nevada, USA. Scale: See Image.
© American Mineralogist

Ellisite: Tl3AsS3

Comments: SEM image of ellisite grains showing rhombohedral cleavage fragments. (AmMin, v64,701).
Location: Mineralized laminated carbonaceous dolomite beds in the Carlin gold deposit, Eureka County, Nevada, USA. Scale: See Image.
© American Mineralogist

Fairchildite: K2Ca(CO3)2

Comments: PPL thin-section image of fused wood-ash stone, showing slightly altered lath-shaped cross-sections of fairchildite in a fine groundmass containing buetschliite and calcite. Inset image shows sample.
Location: Kaniksu National Forest, Idaho. (AmMin, v32:607). Scale: Thin Section 30 X.
© American Mineralogist

Fairchildite: K2Ca(CO3)2

Comments: PPL thin-section image of fused wood-ash stone, showing slightly altered lath-shaped cross-sections of fairchildite in a fine groundmass containing buetschliite and calcite. Inset image shows sample.
Location: Kaniksu National Forest, Idaho. (AmMin, v32:607). Scale: Thin Section 30 X.
© American Mineralogist

Ferro-anthophyllite: [ ]Fe++7Si8O22(OH)2

Comments: TEM image showing a small percentage of Pnma ferroanthophyllite of similar composition is present as thin slabs intergrown parallel to (100) of grunerite and as individual µ-size crystals.
Location: Rockport grunerite, Massachusetts, USA. (AmMin, v86:1252). Scale: See Image.
© American Mineralogist

Ferro-anthophyllite: [ ]Fe++7Si8O22(OH)2

Comments: TEM image showing a small percentage of Pnma ferroanthophyllite of similar composition is present as thin slabs intergrown parallel to (100) of grunerite and as individual µ-size crystals.
Location: Rockport grunerite, Massachusetts, USA. (AmMin, v86:1252). Scale: See Image.
© American Mineralogist

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

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

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

Frankdicksonite: BaF2

Comments: Cubic crystals of frankdicksonite. AmMin v59:885.
Location: Carlin gold deposit, Eureka County, Nevada, USA. 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.
© American Mineralogist

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

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

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

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