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Kupcikite: Cu3.4Fe0.6Bi5S10 Cuprobismutite: Cu10Bi12S23
Comments: Backscattered electron image of kupcĂkite (ku) replacing cuprobismutite (cu); both phases are in turn replaced by bsimuthinite derivative (bd79-92). Location: Felbertal, Austria. Scale: Scale bar 100 µ-m. © Canadian Mineralogist