Iron University of Denver
The oxides are ferrous oxide, FeO and ferric oxide, Fe 2 O 3. Ferrous oxide is not stable against partial oxidation to Fe(II)(Fe(III) 2 O 4 ), usually written Fe 3 O 4 or FeO·Fe 2 O 3 . This hard, black substance is magnetite, an important ore of iron and a very interesting substance in its own right, which will be considered further in connection with magnetism, where its structure will be