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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
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
Armalcolite: (Mg,Fe++)Ti2O5
Comments: Gray semi-metallic armalcolite micro crystals on coal. Location: Chelyabinsk Oblast', Urals Region, Russia. Scale: See Image. © Rruff Database
Arrojadite-(KFe): KNa2CaNa2(Fe++,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2
Comments: Greenish Gray, massive arrojadite-(KFe). Location: Nickel Plate mine, Keystone District, Pennington County, South Dakota, USA. Scale: See Image. © Rruff Database
Arrojadite-(NaFe): NaNa2CaNa2(Fe++,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2
Comments: Dark bluish gray radial crystals of arrojadite-(NaFe). Location: Boundary Creek, Richardson Mountains, Dawson mining district, Yukon Territory, Canada. Scale: See Image. © Rruff Database
Arsenohauchecornite: Ni18Bi3AsS16
Comments: Bright bronze, massive arsenohauchecornite with chonchoidal fracture. Location: Vermilion Mine, Denison Township, Sudbury District, Ontario, Canada. Scale: See Image. © Rruff Database
Arzakite: Hg3S2(Br,Cl)2
Comments: Orange brown arzakite crystals lining vug, co-type material; associated with jarosite (sharp crystals), montroydite (dark red - blackish). Location: Arzak deposit, Tuva, Siberia, Russia. Scale: See Image. © Rruff Database
Aschamalmite: Pb6Bi2S9
Comments: Lead gray metallic prismatic aschamalmite crystals in veins in quartz. Location: Ascham Alp, Untersulzbach Valley, Salzburg, Austria. Scale: See Image. © Rruff Database
Avicennite: Tl2O3
Comments: Grayish black polished crystals on microprobe sample mount. Location: Thallium Prospect, Little Valley, Tooele County, Utah, USA. Scale: See Image. © Rruff Database
Bariandite: Al0.6V8O20·9(H2O)
Comments: Dark bluish black bladed radiating aggregates of bariandite. Location: Mounana mine, Franceville, Haut-Ogooué, Gabon. Scale: See Image. © Rruff Database