chalcopyrite
Chalcopyrite is a common mineral composed of copper and iron sulfide, with the chemical formula CuFeSâ‚‚. It forms in complex crystalline structures that give it a metallic luster and a brass-yellow color, often tarnished with iridescent hues. Chalcopyrite is the most important copper ore mineral, meaning it is a primary source of copper mined worldwide. It typically forms in hydrothermal veins and magmatic deposits. While it is a valuable resource for extracting copper used in electrical wiring, plumbing, and alloys, it also contains sulfur, which can be released during processing and impact the environment.