Pb₅Sn₃Sb₂S₁₄

This sample of franckeite is displayed in the Smithsonian Museum of Natural History. Franckeite is a sulfide mineral of lead, tin and antimony with the composition Pb₅Sn₃Sb₂S₁₄. The sample at left is about 15 cm across and is from San Jose mine, Cerado, Oruro, Bolivia.