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Arseniosiderite: Ca2Fe+++3(AsO4)3O2·3(H2O)
Comments: Yellowish brown, roughly spherical aggregates of arseniosiderite crystals on matrix. Location: Tsumeb mine, Tsumeb, Namibia. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Arseniosiderite: Ca2Fe+++3(AsO4)3O2·3(H2O) Cobaltarthurite: CoFe+++2(AsO4)2(OH)2·4(H2O)
Comments: Olive-greenish crystalline druse of cobaltarthurite with spherical arseniosiderite. Location: Pastrana, Mazarrón, Murcia, Spain. Scale: Picture size 1.3 mm. © Thomas Witzke / Abraxas-Verlag