American Mineralogist's Image Gallery

Abelsonite: Ni++C31H32N4

Comments: Abelsonite (A) grain associated with authigenitc orthoclase (O) and a micaceous mineral (M). (AmMin, v63:930).
Location: Wosco sample (Sec 36 T9S R20E) (Depth 2508.2 - 2508.15). Drill cores in or near the Mahogany Zone oil shale of the Green River Formation in Uintah County, Utah, USA. Scale: Magnification 800 X.
© American Mineralogist

Abelsonite: Ni++C31H32N4

Comments: Abelsonite (A) grain associated with authigenitc orthoclase (O) and a micaceous mineral (M). (AmMin, v63:930).
Location: Wosco sample (Sec 36 T9S R20E) (Depth 2508.2 - 2508.15). Drill cores in or near the Mahogany Zone oil shale of the Green River Formation in Uintah County, Utah, USA. Scale: Magnification 800 X.
© American Mineralogist

Abswurmbachite: Cu++Mn+++6SiO12

Comments: Series of images showing the out-crop, the selected nodule and finally a BSE image of abswurmbachite. (AmMin, v86:205).
Location: Sanbagawa metamorphic belt, Japan. Scale: See Images.
© American Mineralogist

Abswurmbachite: Cu++Mn+++6SiO12

Comments: Series of images showing the out-crop, the selected nodule and finally a BSE image of abswurmbachite. (AmMin, v86:205).
Location: Sanbagawa metamorphic belt, Japan. Scale: See Images.
© American Mineralogist

Akimotoite: (Mg,Fe)SiO3

Comments: Electron micrograph of akimotoite (Ak) as columnar grains. Aggregates of akimotoite are adjacent to a large clinoenstatite grain (Cen) with (100) twin lamallae. (AmMin 84:268).
Location: Shock-metamorphosed Tenham chondrite. Scale: See Image.
© American Mineralogist

Akimotoite: (Mg,Fe)SiO3

Comments: Electron micrograph of akimotoite (Ak) as columnar grains. Aggregates of akimotoite are adjacent to a large clinoenstatite grain (Cen) with (100) twin lamallae. (AmMin 84:268).
Location: Shock-metamorphosed Tenham chondrite. Scale: See Image.
© American Mineralogist

Allabogdanite: (Fe,Ni)2P  
Schreibersite: (Fe,Ni)3P

Comments: Relict grain of allabogdanite crystal (ABG) surrounded by schreibersite rim (SCHR) in plessite matrix (PL). Black phase is a secondary Fe-Ni-hydroxide. Backscattered electron image. (AmMin, 87:1249).
Location: Onello iron meteorite (high-Ni ataxite) Onello River basin, Aldan shield, Saha (Sakha) Republic (Yakutia), Eastern-Siberian Region, Russia. Scale: Scale bar 10 µ-m.
© American Mineralogist

Allabogdanite: (Fe,Ni)2P  
Schreibersite: (Fe,Ni)3P

Comments: Relict grain of allabogdanite crystal (ABG) surrounded by schreibersite rim (SCHR) in plessite matrix (PL). Black phase is a secondary Fe-Ni-hydroxide. Backscattered electron image. (AmMin, 87:1249).
Location: Onello iron meteorite (high-Ni ataxite) Onello River basin, Aldan shield, Saha (Sakha) Republic (Yakutia), Eastern-Siberian Region, Russia. Scale: Scale bar 10 µ-m.
© American Mineralogist

Alpersite: (Mg,Cu)SO4·7H2O

Comments: Bright blue efforescence associated with pickeringite, alunogen, and epsomite. Pickeringite and alunogen (white and yellow) occur on top of a matte of alpersite (blue) adjacent to a concrete wall.
Location: Big Mike mine, Nevada. Scale: Picture size 50 cm.
© American Mineralogist

Alpersite: (Mg,Cu)SO4·7H2O

Comments: Bright blue efforescence associated with pickeringite, alunogen, and epsomite. Pickeringite and alunogen (white and yellow) occur on top of a matte of alpersite (blue) adjacent to a concrete wall.
Location: Big Mike mine, Nevada. Scale: Picture size 50 cm.
© American Mineralogist

Aluminocerite-(Ce): (Ce,REE,Ca)9(Al,Fe+++)(SiO4)3[SiO3(OH)]4(OH)3

Comments: BSE image of the holotype of aluminocerite-(Ce) showing pseudo-octahedral to rombohedral crystals flattened on the c axis. (AmMin v94:488).
Location: Ratti quarry near Baveno, Italy.. Scale: See Image.
© American Mineralogist

Aluminocerite-(Ce): (Ce,REE,Ca)9(Al,Fe+++)(SiO4)3[SiO3(OH)]4(OH)3

Comments: BSE image of the holotype of aluminocerite-(Ce) showing pseudo-octahedral to rombohedral crystals flattened on the c axis. (AmMin v94:488).
Location: Ratti quarry near Baveno, Italy.. Scale: See Image.
© American Mineralogist

Aluminum: Al

Comments: Deep-green phlogopite with Al flake (at the center). AmMin, 94:1983.
Location: Found in a desilicated pegmatite vein, NW Rila Mountain, Bulgaria. Scale: Scale Bar 1 mm.
© American Mineralogist

Aluminum: Al

Comments: Deep-green phlogopite with Al flake (at the center). AmMin, 94:1983.
Location: Found in a desilicated pegmatite vein, NW Rila Mountain, Bulgaria. Scale: Scale Bar 1 mm.
© American Mineralogist

Andreyivanovite: FeCrP

Comments: BSE image of serpentine (gray) grain containing curvilinear arrays of andreyivanovite crystals (A) and associated florenskyite (F) lath. AmMin v93, p1296.
Location: Kaidun meteorite (South Yemen). Scale: Scale Bar 20 µm.
© American Mineralogist

Andreyivanovite: FeCrP

Comments: BSE image of serpentine (gray) grain containing curvilinear arrays of andreyivanovite crystals (A) and associated florenskyite (F) lath. AmMin v93, p1296.
Location: Kaidun meteorite (South Yemen). Scale: Scale Bar 20 µm.
© American Mineralogist

Aristarainite: Na2MgB12O20·8(H2O)

Comments: B&W image of aristarainite crystals freed from the enclosing borax/kernite (AmMin, v59:647).
Location: Tincalayu mine, Salta, Argentina. Scale: See Image.
© American Mineralogist

Aristarainite: Na2MgB12O20·8(H2O)

Comments: B&W image of aristarainite crystals freed from the enclosing borax/kernite (AmMin, v59:647).
Location: Tincalayu mine, Salta, Argentina. Scale: See Image.
© American Mineralogist

Armbrusterite: K5Na6Mn+++Mn++14[Si9O22]4(OH)10·4H2O

Comments: SEM image of a spherulite of platy crystals of armbrusterite (2 mm diameter) on cancrinite and calcite. (AmMin, v92:416).
Location: Khibiny massif, Kola Peninsula, Russia.. Scale: Spherulite Size 2 mm.
© American Mineralogist

Armbrusterite: K5Na6Mn+++Mn++14[Si9O22]4(OH)10·4H2O

Comments: SEM image of a spherulite of platy crystals of armbrusterite (2 mm diameter) on cancrinite and calcite. (AmMin, v92:416).
Location: Khibiny massif, Kola Peninsula, Russia.. Scale: Spherulite Size 2 mm.
© American Mineralogist