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Aheylite: (Fe++,Zn)Al6(PO4)4(OH)8·4(H2O)
Comments: Colorless radiating spray of aheylite crystals. Location: Huanuni, Bolivia. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag
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
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
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
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
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
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
Akhtenskite: Mn++++O2
Comments: Dark gray grains of akhtenskite with brown superficial coating. Location: Akhtenskoye Deposit, Chelyabinsk District, Urals, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Akimotoite: (Mg,Fe)SiO3
Comments: Electron micrograph of akimotoite (Ak) as columnar grains. Aggregates of akimotoite are adjacent to a large clinoenstatite grain (Cen) with (100) twin lamallae. (AmMin 84:268). Location: Shock-metamorphosed Tenham chondrite. Scale: See Image. © American Mineralogist
Akrochordite: Mn4Mg(AsO4)2(OH)4·4(H2O) Eveite: Mn2(AsO4)(OH)
Comments: Micro crystals (to about 0.75mm) of very pale grayish green eveite in tiny vug with light pink akrochordite. Co-Type specimen & type locality. Location: Langban, Varmland, Sweden. Scale: 13x10x4 mm. © Tom Loomis / Dakota Matrix
Aksaite: MgB6O7(OH)6·2(H2O)
Comments: Gray-white massive aksaite fragment photographed through a capsule. Location: Chelkar Salt dome, Ak-Say Valley, Kazakhstan. Scale: Not Given. © Diederik Visser
Aktashite: Cu6Hg3As4S12
Comments: Metallic gray grain of aktashite in quartz gangue. Location: Moctezuma, Mun. de Moctezuma, Sonora, Mexico. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Alabandite: MnS
Comments: Dark gray stalactitic alabandite. Location: Broken Hill Proprietary Mine, Broken Hill, New South Wales, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Alabandite: MnS Daubreelite: Fe++Cr2S4
Comments: Daubreelite (D), bright metallic white, with alabandite (A) (dull yellow) as inclusions in a polished section of an achondrite meteorite. Location: Norton County, Kansas. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Alacranite: As8S9
Comments: Red crystals of alacranite. Location: Mine Wilmsdorfer Schacht, Possendorf near Dresden, Sachsen, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Alamosite: PbSiO3
Comments: White alamosite crystal group. John Schneider Collection. Location: Tsumeb, Namibia. Scale: 3.5x3x2 cm. © Dan Weinrich