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Zykaite: Fe+++4(AsO4)3(SO4)(OH)·15(H2O) Bukovskyite: Fe+++2(AsO4)(SO4)(OH)·7(H2O)
Comments: Pale beige acicular crystals of bukovskýite with white zykaite. Location: Christbescherung Mine, Großvoigtsberg, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 1.3 mm. © Thomas Witzke / Abraxas-Verlag
Zykaite: Fe+++4(AsO4)3(SO4)(OH)·15(H2O)
Comments: Round aggregates of Zykaite. Location: Reiche Zeche Mine, Freiberg, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Specimen size 37 mm. © Thomas Witzke / Abraxas-Verlag