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Friedrichite: Pb5Cu5Bi7S18 Krupkaite: PbCuBi3S6 Benjaminite: (Ag,Cu)3(Bi,Pb)7S12
Comments: Crystals of a mixture of friedrichite, krupkaite, and benjaminite, with quartz crystals. Location: Estela Mine, Julcani District, Junin, Peru. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species