Limonite

Related Category: Mineralogy and Crystallography

(līm´ənīt) or brown hematite(hĕm´ətīt, hē´–), yellowish to dark brown mineral, a hydrated oxide of iron, FeO(OH)·nH₂O, occurring commonly in deposits of secondary origin, i.e., those formed by the alteration of minerals containing iron. Both iron rust and bog iron ore are limonite. It serves as a pigment (see ocher) and as an ore of iron. It is found mainly in Austria and England.