Iron oxide
Iron oxides are chemical compounds. There are sixteen known iron oxides. Iron oxides are used in pigments. It is used in both man-made and natural pigments.
Venetian red (haematite), Magnetite (Fe3O4), or a mixture of oxides make black or purple pigments. The umber, sienna and ochre are oxides or hydrated oxides of a yellow to chestnut colour.
Most iron oxide is mined as iron ore. Every year millions of tons go into blast furnaces to make iron.
Various iron oxides
- Iron(III) oxide, reddish, commonly known as rust, found in the earth as haematite
- Iron(II,III) oxide, magnetic, black, found in the earth as magnetite
- Iron(II) oxide, black, rare, flammable, not stable at room temperature
- Iron(II) hydroxide, dark green hydrated iron oxide
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