Group: Sulfides

Chemical composition: CuFeS2

Colors: Brassy yellow

Hardness: 3.5 to 4

Formation: Tetragonal crystal; tetrahedral form;

Principal Sources: Colorado, Arizona, Tri-State mining district, England, Tasmania, Germany, Canada, Spain, Japan, and China

Special Notes: Although not rich in copper, chalcopyrite’s widespread occurrences make it the most important copper ore.