Jordanite

This sample of jordanite is displayed in the Smithsonian Museum of Natural History. Jordanite is an sulfide mineral of lead, arsenic and antimony with the composition Pb₁₄(As, Sb)₆S₂₃. This sample is about 5x4 cm and is from Lengengach quarry, Imfeld, Binnatal, Valais, Switzerland.