1、Iron oxide pigment is a color pigment whose basic substance is the oxide of iron, such as red oxide, yellow iron oxide, black iron oxide, and brown oxide.
3、The mineral form of black iron oxide, Fe3O4, that often occurs with magnesium, zinc, and manganese and is an important ore of iron.
2、Any of a group of widely occurring yellowish - brown to black iron oxide minerals, essentially FeO(OH)?H2O, used as a minor ore of iron.
