loadstone,
lodestone a permanent magnet consisting of magnetite that possess polarity and has the power to attract as well as to be attracted magnetically
Magnetite is a ferrimagnetic mineral with chemical formula Fe3O4, one of several iron oxides and a member of the spinel group. The chemical IUPAC name is iron(II,III) oxide and the common chemical name ferrous-ferric oxide. The formula for magnetite may also be written as FeO·Fe2O3, which is one part wüstite (FeO) and one part hematite (Fe2O3).
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magnetite A magnetic mineral with the chemical formula Fe3O4.