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Franckeite: (Pb,Sn)6Fe++Sn2Sb2S14 Potosiite: Pb6Sn2FeSb2S14
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
Franckeite: (Pb,Sn)6Fe++Sn2Sb2S14
Comments: Massive franckeite with pockets of small .5 mm crystals. Location: Animas Mine, Atocha-Quechisla district, Sud Chichas Province, Potosà Department, Bolivia. Scale: 25x20x15 mm. © John Betts - Fine Minerals