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Analcime: NaAlSi2O6·(H2O)
Comments: Brownish yellow transparent analcime crystals. Location: Guam. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Ancylite-(Ce): SrCe(CO3)2(OH)·(H2O)
Comments: Pinkish brown ancylite-(Ce) blades. Location: Mont St. Hilaire, Quebec, Canada. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Andorite: PbAgSb3S6
Comments: Metallic, prismatic andorite crystal. Location: Baie Sprie (Felsobanya), Maramures, Romania. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Annabergite: Ni3(AsO4)2·8(H2O)
Comments: Green spray of annabergite crystals. Location: Laurium, Greece. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Antlerite: Cu3(SO4)(OH)4
Comments: Dark green crystals of antlerite on sandstone. Location: Ray mine, Ray, Pinal County, Arizona, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
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