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Arrojadite-(BaFe): (Ba,K,Pb)Na3(Ca,Sr)(Fe++,Mg,Mn)14Al(PO4)11(PO3OH)(OH,F)2
Comments: Small grain of Arrojadite-(BaFe). Location: Big Fish River, Yukon, Canada. Scale: Not Given. © Sergey Vasiliev / Systematic Mineralogy
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-(KNa): KNa4Ca(Fe,Mn,Mg)13Al(PO4)11(PO3OH)(OH,F)2
Comments: Brownish crystals of arrojadite-(KNa). Location: Big Fish River, Dawson Mining District, Yukon Territory, Canada. Scale: Picture Size 4 mm. © Thomas Witzke / Abraxas-Verlag
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
Arsenbrackebuschite: Pb2(Fe++,Zn)(AsO4)2·(H2O)
Comments: Brownish yellow arsenbrakenbuschite crystals on matrix. Location: Tsumeb, Namibia.. Scale: Not Given. © William Pinch
Arsendescloizite: PbZn(AsO4)(OH)
Comments: Spherical aggregates of arsendescloizite crystals. Location: Tsumeb mine, Tsumeb, Namibia. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Arsenic: As
Comments: Botryoidal-concentric aggregate of arsenic with white calcite crystals. Location: Schneeberg, Erzgebirge, Sachsen, Germany. Scale: 7 x 4 cm. © Thomas Witzke / Abraxas-Verlag
Comments: Bright, metallic, gray, crystalline aggregate or arsenic. Location: Niederschlema, Saxony, Germany. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Arsenic: As Claudetite: As2O3
Comments: Colorless prismatic crystal of claudetite on native arsenic. Location: Jáchymov (St Joachimsthal), Krusné Hory (Erzgebirge), Západoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag
Arseniopleite: (Ca,Na)(Na,Pb)Mn++(Mn++,Mg,Fe++)2(AsO4)3
Comments: Massive, orange arseniopleite. Location: Sjögruvan, Grythyttan, Örebro, Sweden. Scale: Not Given. © Tom Loomis / Dakota Matrix