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Arakiite: (Zn,Mn++)(Mn++,Mg)12(Fe+++,Al)2(AsO3)(AsO4)2(OH)23
Comments: Deep red massive arakiite between grains. Location: Nordmark, Sweden. Scale: See Image. © Rruff Database
Aramayoite: Ag3Sb2(Sb,Bi)S6 Miargyrite: AgSbS2
Comments: Aramayoite is present as large thin plates (blue iridescence) to 1mm in massive gray miargyrite matrix. Location: Julcani Silver mine, Huancavelica Dept., Peru. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Arapovite: (U,Th)(Ca,Na)2(K1-x[ ]x)Si8O20·H2O, x=0.5
Comments: Dark green prismatic arapovite crystals with rectangular shapes. Location: Dara-i-Pioz Glacier, Hait, Alayskiy (Alai) Range, Tien Shan Mountains, Tajikistan. Scale: See Image. © Rruff Database
Aravaipaite: Pb3AlF9·(H2O)
Comments: Colorless thin tabular crystals of aravaipaite. Location: Grand Reef Mine, Aravaipa District, Graham County, Arizona, USA. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Arcanite: K2SO4
Comments: SEM image of a sub-spherical aggregate of arcanite. Location: Ghar al Hibashi Harrat Nawasif/Al Buqum, Kingdom of Saudi Arabia. Scale: See Image. © Saudi Geological Survey
Comments: Opaque olive-green mottled-colored arcanite. Location: Tunnel #1, Santa Ana Tin Mine, Orange County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Archerite: (K,NH4)H2PO4 Biphosphammite: (NH4,K)H2PO4
Comments: Buff-colored biphosphammite with white archerite crusts. Location: Cockelbiddy Cave, Western Australia, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Arctite: Na2Ca4(PO4)3F
Comments: Clear glassy crystalline arctite with magenta villiaumite in pegmatite. Location: Vuonnemiok River, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ardaite: Pb19Sb13S35Cl7
Comments: B&W image of 1. Ardaite; 2. Chlorine-containing robinsonite; 3. Nadorite; 4. Anglesite; 5. Galena. Location: Madjarovo polymetallic ore deposit, Bulgaria. (MinMag, v 46:340). Scale: Magnification 120 x. © Mineralogical Magazine
Ardealite: Ca2(SO4)(HPO4)·4(H2O)
Comments: Ardealite powder. Location: Moorba Cave, Jurien Bay, Western Australia, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species