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Abernathyite: K(UO2)(AsO4)·4(H2O)
Comments: Clear, yellow, crystalline abernathyite crystal group. Location: Temple Mountain, Every County, Utah, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Acanthite: Ag2S
Comments: Pseudo cubic acanthite crystals on matrix. Location: Rayas mine, Guanajuato, Mexico. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Adamite: Zn2(AsO4)(OH) Cryptomelane: K(Mn++++,Mn++)8O16
Comments: Black, rounded balls of cryptomelane and purple, transparent adamite. Location: Ojuela mine, Mapimi, Druango, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Aegirine: NaFe+++Si2O6 Pectolite: NaCa2Si3O8(OH)
Comments: White, cottony pectolite tufts with acicular aegirine. Location: 3M quarry, Little Rock, Pulaski County, Arkansas, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Agardite-(Ca): CaCu6(AsO4)3(OH)6·3(H2O)
Comments: Green, acicular sprays of agardite (agardite-Ca?) on matrix. Location: Big Three mine, Silver Peak, Esmeralda County, Nevada, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Agrinierite: (K2,Ca,Sr)U3O10·4(H2O)
Comments: Golden yellow, transparent agrinierite crystals. Location: Margnac mine, Compreignac, Haute-Vienne, France. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Ajoite: (K,Na)3Cu20Al3Si29O76(OH)16·~8(H2O)
Comments: Bluish, bladed ajoite crystals. Location: New Cornelia mine, Ajo, Pima County, Arizona, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Ajoite: (K,Na)3Cu20Al3Si29O76(OH)16·~8(H2O) Shattuckite: Cu5(SiO3)4(OH)2
Comments: Dark blue, tabular crystals of shattuckite on light blue ajoite. Location: New Cornelia mine, Ajo, Pima County, Arizona, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Allactite: Mn7(AsO4)2(OH)8
Comments: Brownish red allactite crystals. Location: Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Almandine: Fe++3Al2(SiO4)3
Comments: Two reddish brown crystals of almandine on matrix. Location: Fanny Gorge mine, Spruce Pine, Mitchell County, North Carolina, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Alstonite: BaCa(CO3)2
Comments: Transparent alstonite crystals. Location: Hexham, Northumberland, England. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Altaite: PbTe
Comments: Bronze yellow metallic altaite crystals. Location: Sonora, Tuolumne County, California, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Aminoffite: Ca3Be2Si3O10(OH)2
Comments: Clear, pyramidal aminoffite crystal. Location: Langban, Varmland, Sweden. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
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
Apatite: Ca5(PO4)3(OH,F,Cl) Carbonate-fluorapatite: Ca5(PO4,CO3)3F
Comments: Pink, colliform carbonate-fluorapatite on matrix. Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Apatite: Ca5(PO4)3(OH,F,Cl) Robertsite: Ca6Mn+++9(PO4)9O6(H2O)6·3(H2O) Carbonate-hydroxylapatite: Ca5(PO4,CO3)3(OH)
Comments: Black crystals of Robertsite on pink carbonate-hydroxylapatite. Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals