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Chemical formula and color of main iron oxides (Reproduced with permission from Bruce, I.J. et al., Journal of Magnetism and Magnetic Materials; published by Elsevier B.V., 2004. from ref [33]).
| Iron Oxide | Chemical Formula (Current Name) | Color |
|---|---|---|
| Ferrous oxide (iron(II) oxides) | FeO (Wüstite) | Black |
| Mixed-oxide (iron(II, III) oxides) | Fe3O4 or FeO.Fe2O3 (Magnetite) | Black |
| Ferric oxides (iron(III) oxides) | α-Fe2O3 (Hematite) β-Fe2O3 γ-Fe2O3 (Maghemite) ε-Fe2O3 |
Grey, brown, red |
