Pyrrhotite

This sample of pyrrhotite (formed with quartz) is displayed in the Smithsonian Museum of Natural History. Pyrrhotite is a sulfide mineral of iron with the designated composition Fe_1-xS . This sample is about 6x10 cm and is from Trepca mine, Srbija, Yugoslavia.

This sample of pyrrhotite is about 10x6 cm and is from Dalnegorsk, Primorskiy Kray, Russia.