This sample of bornite is displayed in the Smithsonian Museum of Natural History. Bornite is an sulfide mineral of copper and iron with the composition Cu5FeS4. This sample is about 3X3 cm and is from Shaba, D. R. Congo.

Bornite is an important copper ore. It has a copper-red color on fresh exposures which quickly tarnishes to an iridescent purple after exposure to air and moisture.

This sample of bornite is about 18 cm across and is from Steward mine, Butte, Montana..

This sample is described as bornite with quartz. It is about about 12x13 cm and is from Nicolai mine, Dalnegorsk, Primorskiy Kray, Russia.

This sample of bornite is about 6x8 cm and is from Cornwall, England.

Mindat: Bornite

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