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The mineral form of iron II oxide is known as wüstite. Hematite (69.9% Fe) and Magnetite ( 72.4% Fe) are two other examples of iron oxide. Magnetite has naturally high iron content than Hematite.
iron-to-oxygen ratios of
Hematite
3.79 g of Fe and 1.63 g O
and
Magnetite
22.8 g Fe and 8.70 g O
where Fe symbolise iron and O symbolise oxygen.