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Aragonite: CaCO3
Comments: Clear, crystalline aragonite prism. Location: Tsumeb mine, Tsumeb, Namibia. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Argentopyrite: AgFe2S3
Comments: Metallic, twinned argentopyrite grain on matrix. Location: St. Andreasberg, Harz, Lower Saxony, Germany. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Argyrodite: Ag8GeS6
Comments: Lead gray metallic aggregate of argyrodite crystals. Location: Veta Galufa, Colquechaca, Potosi Dept., Bolivia. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Armenite: BaCa2Al6Si9O30·2(H2O)
Comments: Translucent, white armenite crystals. Location: Simplon Pass, Brig, Valais, Switzerland. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Arsendescloizite: PbZn(AsO4)(OH)
Comments: Spherical aggregates of arsendescloizite crystals. Location: Tsumeb mine, Tsumeb, Namibia. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Arsenic: As
Comments: Bright, metallic, gray, crystalline aggregate or arsenic. Location: Niederschlema, Saxony, Germany. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Arseniosiderite: Ca2Fe+++3(AsO4)3O2·3(H2O)
Comments: Yellowish brown, roughly spherical aggregates of arseniosiderite crystals on matrix. Location: Tsumeb mine, Tsumeb, Namibia. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Arsenolite: As2O3
Comments: Brownish yellow octahedrons of arsenolite on matrix. Location: White Caps mine, Manhattan, Nye County, Nevada, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Artinite: Mg2(CO3)(OH)2·3(H2O)
Comments: Bright, white acicular sprays of artinite crystals on matrix. Location: New Idria district, San Benito County, California, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
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
Augite: (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6
Comments: Clear, dark gray augite prisms in matrix. Location: Isle of Ischia, near Naples, Compania, Italy. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Austinite: CaZn(AsO4)(OH)
Comments: Green, spherulitic clusters of austinite crystals. Location: Gold Hill mine, Deep Creek Mts., Tooele County, Utah, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Axinite-(Mn): Ca2Mn++Al2BO3Si4O12(OH)
Comments: Dark brown crystal of manganaxinite on matrix. Location: Kibblehouse quarry, Perkiomenville, Pennsylvania, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Azurite: Cu3(CO3)2(OH)2 Clinotyrolite: Ca2Cu9[(As,S)O4]4(OH)10·10(H2O)
Comments: Light blue acicular crystals of clinotyrolite on dark blue azurite. Location: Lovelock mine, Churchill County, Nevada, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Babingtonite: Ca2(Fe++,Mn)Fe+++Si5O14(OH)
Comments: Small, single crystal of babingtonite on matrix. Location: Blueberry Mountain, Woburn. Middlesex County, Massachusetts, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Barbosalite: Fe++Fe+++2(PO4)2(OH)2
Comments: Black, cruciform quadrilling twins of barbosalite crystals. Location: Sapucaia, Mina Gerais, Brazil. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Barbosalite: Fe++Fe+++2(PO4)2(OH)2 Phosphosiderite: Fe+++PO4·2(H2O)
Comments: Transparent, brown crystal of phosphosiderite on black barbosalite. Location: Bull Moose mine, Custer, Custer County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Bariopharmacosiderite: BaFe+++4(AsO4)3(OH)5·5(H2O)
Comments: Reddish brown, crystal of barium-pharmacosiderite on matrix. Location: Clara Mine, Wolfach, Baden-Wurt., Germany. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Barnesite: Na2V6O16·3(H2O)
Comments: Bright red, acicular crystals of barnesite on matrix. Location: Cactus Rat claim, Thompson, Grand County, Utah, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Basaluminite: Al4(SO4)(OH)10·5(H2O)
Comments: Clear, radial sprays of basaluminite crystals. Location: Lavender Pit, Bisbee, Cochise County, Arizona, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals