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Altogether there are 16 known iron oxides.[1] These compounds are either oxides (Hematite, Magnetite, Maghemite, β-Fe<sub>2</sub>O<sub>3</sub>, ε-Fe<sub>2</sub>O<sub>3</sub>, Wüstite), or hydroxides and oxide-hydroxides (Goethite, Lepidocrocite, Akageneite, Schwertmannite, Feroxyhyte, δ-FeOOH, high pressure FeOOH, Ferrihydrite, Bernalite, Fe(OH)<sub>2</sub>, green rusts).