Various magnetite samples | Source: Sandatlas

Magnetite is the world's most magnetic naturally occurring mineral and one of the two primary iron ores, alongside hematite. Named after the ancient region of Magnesia (Greece) where it was first described, it is the natural mineral form of iron(II,III) oxide (Fe₃O₄) and the ore with the highest theoretical iron content of any commercially mined mineral at 72.4% Fe.

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