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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
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
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