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Asbecasite: Ca3(Ti,Sn)As+++6Si2Be2O20
Comments: Brownish yellow asbecasite prismatic crystal. Location: Cervandone, Val d'Ossola, Lombardy, Italy. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Asbolane: (Co,Ni)1-y(Mn++++O2)2-x(OH)2-2y+2x·n(H2O)
Comments: Brownish red dull grains of asbolane to 2mm in matrix. Location: Lipovka, Middla Urals, Russia. Scale: Picture size 1 cm. © Tom Loomis / Dakota Matrix
Aschamalmite: Pb6Bi2S9
Comments: Lead gray metallic prismatic aschamalmite crystals in veins in quartz. Location: Ascham Alp, Untersulzbach Valley, Salzburg, Austria. Scale: See Image. © Rruff Database
Comments: Black metallic blades of aschamalmite associated with beige rhombic siderite. Location: Costabella, Osiglia, SV, Italy. Scale: Crystal Size: 1 mm. © Carlo Guidarin
Ashburtonite: HPb4Cu++4Si4O12(HCO3)4(OH)4Cl
Comments: Blue-green crystalline crust of ashburtonite on matrix. Location: Anticline Deposit, Ashburton Downs, Western Australia, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Asisite: Pb12(SiO4)O8Cl4
Comments: Orange brownish asisite on matrix. Location: Kombat Mine, Kombat, Namibia. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
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
Asselbornite: (Pb,Ba)(UO2)6(BiO)4(AsO4)2(OH)12·3(H2O)
Comments: Small orange cubes of asselbornite on yellow uranophane. Location: Weißer Hirsch Mine, Schneeberg, Erzgebirge, Sachsen, Germany. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Astrocyanite-(Ce): Cu2(Ce,Nd,La)2(UO2)(CO3)5(OH)2·1.5(H2O)
Comments: Blue-green bladed astrocyanite-(Ce) crystals on black uraninite ore. Schumacher Collection. Location: Kamoto East Open cut, Kamoto, Kolwezi, Western area, Shaba Cu belt, Shaba (Katanga), Congo (Zaïre). Scale: Picture size 2 cm. © Paul M. Schumacher
Astrophyllite: K2Na(Fe++,Mn)7Ti2Si8O26(OH)4
Comments: Dark brown acicular masses of astrophyllite in calcite matrix. Location: Khibini, Kola Peninsula, Russia. Scale: 11 x 9 cm. © Fabre Minerals