Iron(II,III) Oxide: molecular structure (top), crystal lattice structure (bottom left), magnetite powder (bottom right) | Various sources

Iron(II,III) oxide, commonly known by its mineral name magnetite, is a mixed-valence iron oxide containing iron in both the +2 and +3 oxidation states. Its molecular formula is Fe₃O₄, and its constituent formula (or double oxide notation) is FeO·Fe₂O₃. It is the most strongly magnetic naturally occurring mineral on Earth and the second most industrially important iron oxide after diiron trioxide (hematite).

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