CuFe2S3, also known as chalcopyrite, is a mineral composed of copper, iron, and sulfur. It has a tetragonal crystal structure and is often found in hydrothermal veins. Chalcopyrite is an important ore of copper, making it significant in mining and metallurgy. This mineral typically exhibits a brassy yellow color and a metallic luster. It is commonly associated with other sulfide minerals, such as pyrite and sphalerite. Chalcopyrite is also used in the production of copper and can be found in various geological environments around the world.