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Geminite: Cu++2As+++++2O7·3(H2O)
Comments: Pale greenish crystals of geminite with a light blue, lavendulane-related mineral. Location: Shaft 371, Schlema-Hartenstein area, Erzgebirge, Saxony, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag