A number of chemicals are dubbed
iron(III) oxide-hydroxide. These chemicals are
oxide-
hydroxides of
iron, and may occur in
anhydrous (FeO) or
hydrated (FeO·n
H2O) forms. The monohydrate (FeO·
H2O) might otherwise be described as
iron(III) hydroxide (Fe
3), and is also known as
hydrated iron oxide or
yellow iron oxide.