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Kaatialaite: Fe+++[H2As+++++O4]3·5-5.5(H2O)
Comments: White kaatialaite with arsenolite on native arsenic. Location: Shaft 371, Schlema-Hartenstein area, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag