Black mineral is a term used to describe a variety of minerals that are black in color. ONYX is a type of black mineral composed of silicon dioxide and is often used in jewelry. JET is a type of black mineral made from carbonized wood and is often used for carving. GRAPHITE is a black mineral composed of carbon and is used in pencils and lubricants. COAL is a black mineral composed of carbon and is used as a fuel source. TALC is a black mineral composed of magnesium silicate and is used in cosmetics and paint. Tinstone is a black mineral composed of iron sulfide and is used in the production of sulfuric acid.