American Mineralogist's Image Gallery

Aspidolite: NaMg3AlSi3O10(OH)2

Comments: B&W thin section (PPL) of a clinopyroxene leuconorite showing Na-rich phlogopite surrounding corroded plagioclase (Pl). (AmMin, v86:29).
Location: Gabbroic crustal zenoliths form Volcan San Pedro, Chilean Andes. Scale: See Image.
© American Mineralogist

Aspidolite: NaMg3AlSi3O10(OH)2

Comments: B&W thin section (PPL) of a clinopyroxene leuconorite showing Na-rich phlogopite surrounding corroded plagioclase (Pl). (AmMin, v86:29).
Location: Gabbroic crustal zenoliths form Volcan San Pedro, Chilean Andes. Scale: See Image.
© American Mineralogist

Balkanite: Cu9Ag5HgS8

Comments: B&W image of a polished section of balkanite with polysynthetic twinning. (AmMin v58:11).
Location: Sedmochislenitsi mine, Vratsa district, in the western part of the Stara Planina, Bulgaria. Scale: 330 X.
© American Mineralogist

Balkanite: Cu9Ag5HgS8

Comments: B&W image of a polished section of balkanite with polysynthetic twinning. (AmMin v58:11).
Location: Sedmochislenitsi mine, Vratsa district, in the western part of the Stara Planina, Bulgaria. Scale: 330 X.
© American Mineralogist

Bamfordite: Fe+++Mo2O6(OH)3·(H2O)

Comments: Scanning electron micrograph showing the typical morphology of bamfordite crystals. (AmMin, 83:173).
Location: Abandoned W-Mo-Bi mines at Bamford, Queensland, Australia. Scale: Scale Bar 20 µm.
© American Mineralogist

Bamfordite: Fe+++Mo2O6(OH)3·(H2O)

Comments: Scanning electron micrograph showing the typical morphology of bamfordite crystals. (AmMin, 83:173).
Location: Abandoned W-Mo-Bi mines at Bamford, Queensland, Australia. Scale: Scale Bar 20 µm.
© American Mineralogist

Barioperovskite: BaTiO3

Comments: BSE image showing one area where barioperovskite (BaTiO3) micro- to nano-crystals occur in the tubular inclusion, along with BaTi2O5 and fresnoite. Inset B&W image shows inclusion in benitoite with area of magnification in red outline.
Location: Benitoite Mine, San Benito County, California, U.S.A. Scale: See Images.
© American Mineralogist

Barioperovskite: BaTiO3

Comments: BSE image showing one area where barioperovskite (BaTiO3) micro- to nano-crystals occur in the tubular inclusion, along with BaTi2O5 and fresnoite. Inset B&W image shows inclusion in benitoite with area of magnification in red outline.
Location: Benitoite Mine, San Benito County, California, U.S.A. Scale: See Images.
© American Mineralogist

Bartonite: K3Fe10S14

Comments: B&W polished section image showing an irregular remnant of bright pyrrhotite (py) in a matrix of bartonite (ba) veined by silicates. (AmMin, v66:369).
Location: Found in a mafic, alkalic diatreme at Coyote Peak, Humboldt County, California, USA. Scale: Picture Size 1.3? x 1.94 mm.
© American Mineralogist

Bartonite: K3Fe10S14

Comments: B&W polished section image showing an irregular remnant of bright pyrrhotite (py) in a matrix of bartonite (ba) veined by silicates. (AmMin, v66:369).
Location: Found in a mafic, alkalic diatreme at Coyote Peak, Humboldt County, California, USA. Scale: Picture Size 1.3? x 1.94 mm.
© American Mineralogist

Baumstarkite: Ag3(Sb,As)2SbS6

Comments: Fragments of baumstarkite with zoning of darker lamellae with higher As content. (AmMin 87:755).
Location: San Genaro mine, Huancavelica Department, Peru.. Scale: See Image.
© American Mineralogist

Baumstarkite: Ag3(Sb,As)2SbS6

Comments: Fragments of baumstarkite with zoning of darker lamellae with higher As content. (AmMin 87:755).
Location: San Genaro mine, Huancavelica Department, Peru.. Scale: See Image.
© American Mineralogist

Bernalite: Fe(OH)3

Comments: B&W image of pseudo-octahedral crystals of bernalite on goethite. (AmMin, v78:827).
Location: Proprietary mine, Broken Hill, New South Wales, Australia. Scale: Scale Bar 3 mm.
© American Mineralogist

Bernalite: Fe(OH)3

Comments: B&W image of pseudo-octahedral crystals of bernalite on goethite. (AmMin, v78:827).
Location: Proprietary mine, Broken Hill, New South Wales, Australia. Scale: Scale Bar 3 mm.
© American Mineralogist

Birchite: Cd2Cu2(PO4)2(SO4)·5H2O

Comments: SEM image showing bladed crystals of birchite on anglesite. The crystals are flattened on (100) and show the principal forms {100}, {010}, and {101}. (AmMin, v93:912).
Location: Block 14 Opencut, Broken Hill, New South Wales, Australia. Scale: Scale Bar 50µm.
© American Mineralogist

Birchite: Cd2Cu2(PO4)2(SO4)·5H2O

Comments: SEM image showing bladed crystals of birchite on anglesite. The crystals are flattened on (100) and show the principal forms {100}, {010}, and {101}. (AmMin, v93:912).
Location: Block 14 Opencut, Broken Hill, New South Wales, Australia. Scale: Scale Bar 50µm.
© American Mineralogist

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

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

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