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Auricupride: Cu3Au
Comments: Golden metallic veins of auricupride in quartz. Location: Vacos Hielados, Chile. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Aurorite: (Mn,Ag,Ca)Mn++++3O7·3(H2O)
Comments: Brown, dendritic aurorite in white calcite. Location: Aurora Mine, Hamilton, White Pine County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Avogadrite: (K,Cs)BF4 Malladrite: Na2SiF6
Comments: Botryoidal pinkish-white avogadrite with yellow malladrite. Location: Eruption of 1926, Vesuvius, Campania, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Awaruite: Ni2Fe to Ni3Fe
Comments: Massive awaruite. Location: Heazlewood River, Tasmania, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Azoproite: (Mg,Fe++)2(Fe+++,Ti,Mg)BO5
Comments: Black, acicular azoproite in matrix. Location: Tazheran Massif, Transbaikalia, Irkutsk District, Siberia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Bafertisite: Ba(Fe++,Mn)2TiSi2O7(O,OH)2
Comments: Tan crystal spray of bafertisite in pegmatite. Location: Fountain Quarry, Pitt County, North Carolina, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Baghdadite: Ca3(Zr,Ti)Si2O9
Comments: A small, 0.01 cm, grain of baghdadite identifyable in the inset SW-UV image. Location: Fuka mine, Bitchu-cho, Takahashi, Okayama Prefecture, Chugoku Region, Honshu Island, Japan. Scale: Picture Size 1 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Bahianite: Al5Sb+++++3O14(OH)2
Comments: Rounded grain of bahianite. Location: Garimpo de Morro, Paramirim Region, Bahia, Brazil. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Bakerite: Ca4B4(BO4)(SiO4)3(OH)3·(H2O)
Comments: Porcelain-like, massive bakerite. Location: Twenty Mule Canyon, Death Valley, Inyo County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Baksanite: Bi6Te2S3
Comments: Gray metallic grain of baksanite surrounded by white calcite. Location: Tyrnyauz, Kabardino-Balkaria Republic, North Caucasus, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species