Iron(II) oxide, also known as ferrous oxide, is a chemical compound composed of iron and oxygen. Its chemical formula is FeO, indicating that it contains one iron atom for every oxygen atom. This compound typically appears as a black powder and is used in various applications, including pigments and ceramics. In nature, iron(II) oxide can be found in some minerals and is often produced during the oxidation of iron. It plays a role in the production of iron and steel, as well as in the manufacturing of certain types of glass.