German Bornit, from Ignaz von Born †1791 Austrian mineralogist
First Known Use: circa 1847
Common copper-ore mineral, copper and iron sulfide (CuFeS). Typical occurrences are found in Mount Lyell, Tasmania; Chile; Peru; and Butte, Mont. Bornite may form isometric crystals but occurs most commonly as irregular masses. Under appropriate geologic conditions, it alters to chalcocite and other copper minerals.