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Ahlfeldite: (Ni,Co)SeO3·2(H2O)
Comments: Green encrustations of ahlfeldite on matrix. Location: Mina El Dragon, Potosi, Bolivia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Aikinite: PbCuBiS3 Berryite: Cu3Ag2Pb3Bi7S16
Comments: Fine-grained, gray, metallic granular berryite with silvery, metallic, prismatic aikinite. Location: Mike Mine, San Juan County, Colorado. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Aikinite: PbCuBiS3
Comments: Gray metallic prismatic crystals of aikinite and crystalline quartz. Location: Mike Mine, San Juan County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ajoite: (K,Na)3Cu20Al3Si29O76(OH)16·~8(H2O)
Comments: Aqua blue, long bladed crystals or ajoite on matrix. Location: New Cornelia mine, Pima Co., Arizona, USA. Scale: Crystal size 0.75 mm. © Tom Loomis / Dakota Matrix
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
Akaganeite: Fe+++(O,OH,Cl)
Comments: Rusty brown coating of akaganeite on rock. Location: Wells, Elko County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Akatoreite: (Mn++,Fe++)9Al2Si8O24(OH)8 Rhodonite: (Mn++,Fe++,Mg,Ca)SiO3
Comments: Brown akatoreite in pink rhodonite. Location: Akatore Creek, Eastern Otago Peninsula, South Island, New Zealand. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Akdalaite: 5(Al2O3)·(H2O)
Comments: Crystalline white akdalaite. Location: Bulla Island, Caspian Sea, Kazakhstan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Akermanite: Ca2MgSi2O7
Comments: White translucent crystals akermanite. Location: Lago de Vico, Viterbo, Lazio, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species