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Mrazekite: Bi+++2Cu++3(PO4)2O2(OH)2·2(H2O)
Comments: Blue, prismatic crystal of mrázekite on matrix. Location: Arme Hilfe Mine, Ullersreuth, Hirschberg, Vogtland, Saxony, Germany. Scale: Picture size 1.2 mm. © Thomas Witzke / Abraxas-Verlag