magnetite

(magnə tīt′)

noun

a black, hard, magnetic mineral, (Fe,Mg)FeO, that is a major ore of iron

Origin: Ger magnetit: see magnet & -ite

See magnetite in American Heritage Dictionary 4

noun
The mineral form of black iron oxide, Fe3O4, that often occurs with magnesium, zinc, and manganese and is an important ore of iron.

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