Cubanite is a rare mineral composed of copper and iron sulfide, with the chemical formula CuFe2S3. It typically appears as metallic, brassy yellow crystals and is often found in hydrothermal deposits. Cubanite is primarily associated with other minerals such as chalcopyrite and pyrite, and it can be identified by its distinctive color and crystal structure. This mineral was first discovered in Cuba in the 19th century, which is how it got its name. Cubanite is not commonly used in industrial applications but is of interest to mineral collectors and geologists studying sulfide mineralization processes.