What is the classical system Fe2O3?

Fe2O3, or iron(III) oxide, is a classical inorganic compound commonly known as rust. It occurs naturally as the mineral hematite and is characterized by its reddish-brown color. In addition to its role in corrosion processes, Fe2O3 is utilized in various applications, including pigments, ceramics, and as a catalyst in chemical reactions. Its structure consists of iron in the +3 oxidation state, bonded to oxygen in a crystal lattice arrangement.