CuFeS2, commonly known as chalcopyrite, is a mineral composed of copper, iron, and sulfur. It has a tetragonal crystal structure and is typically found in a brassy yellow color, resembling gold. Chalcopyrite is an important ore of copper, making it significant in mining and metallurgy. This mineral is often associated with other sulfide minerals and can be found in various geological environments, including hydrothermal veins and igneous rocks. CuFeS2 is also used in the production of semiconductors and photovoltaic cells, highlighting its relevance in both industrial and technological applications.