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Fe3O4 is the mineral magnetite, with aproper chemical name of Fe(II, III) oxide. it exhibits ferrimagnetism.

It has iron atoms as FeII and FeIII.

An old way of writing it was FeO.Fe2O3

The balanced equation for production from the elements is :-

3Fe + 2O2 -> Fe3O4

Commercially it is made by for example redung Fe2O3 with CO

3Fe2O3 + CO = 2Fe3O4 +CO2

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