Hematite (American English) or haematite (British English) is a common mineral that is mined as the principal ore of iron. Chemically, it corresponds to iron(III) oxide (Fe2O3), one of several iron oxides. It can be found in a range of colors, including black, silver-gray, and brown to reddish brown. The reddish brown color makes it suitable for use as a pigment. Polished, good quality hematite has an attractive appearance and is often used in jewelry.