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Potosiite: Pb6Sn2FeSb2S14 Franckeite: (Pb,Sn)6Fe++Sn2Sb2S14
Comments: Visually indistinguishable metallic potosiite/franckeite crystals to 6 mm.. Location: San Jose mine, Oruro City, Oruro Department, Bolivia. Scale: Crystal size 6 mm. © Rob Lavinsky