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.