Iron(II) oxide, also known as ferrous oxide or ferrous iron, is one of the iron oxides. It is a black-colored powder with the chemical formula FeO. It consists of the chemical element iron in the oxidation state of 2 bonded to oxygen. Its mineral form is known as wüstite. The latter term is often used synonymously to ferrous oxide.
Molecular weight: 71.85
Melting Point: 1370°C
CAS number: 1345-25-1
Iron(II) oxide should not be confused with rust, which usually consists of iron(III) oxide (ferric oxide).
Iron(II) oxide is used as a pigment. It is FDA-approved for use in cosmetics and it is used in some tattoo inks.
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