Chalcopyrite has been the principal ore of copper since smelting began thousands of years ago. This material consists of a sulfide of copper and iron.
Pyrite and Chalcopyrite are both sulfide minerals, but their chemical composition is different. The key difference between pyrite and chalcopyrite is that pyrite contains iron sulfide, whereas chalcopyrite contains sulfides of copper and iron.
Still, this material is quite dense and heavy and can resemble a similar brassy golden luster as Pyrite.