| (Cu,Fe)12(As,Sb)4S13
This sample is labeled as tennantite-tetrahedrite and is displayed in the Smithsonian Museum of Natural History. Tennantite is a sulfide mineral of copper, iron, arsenic and antimony with the composition (Cu,Fe)12(As,Sb)4S13 . This sample is about 20x18 cm and is from El Cobre, Chihuahua, Mexico . This sample is formed with quartz and tetrahedrite.
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