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.

This sample of tennantite is about 3x8 cm and is from Tsuneb, Namibia. This sample is formed with quartz and dolomite. Its composition is indicated to be (Cu,Fe)12As4S13

Mindat: Tennantite

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