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Magnetite, a magnetic oxide of iron used on recording tapes, crystallises with iron atoms occupying 1/8 of the tetrahedral holes and 1/2 of the octahedral

Magnetite, a magnetic oxide of iron used on recording tapes, crystallises with iron atoms occupying 1/8 of the tetrahedral holes and 1/2 of the octahedral holes in a closed packed array of oxide ions. What is the formula of the magnetite?

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