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The oxidation state

of Fe in Fe3O4 is 8/3. This is possible because two of the irons are +3, but the other one is +2. The crystal structure of magnetite actually has two different sites in which these two different ions reside. No single Fe has a charge of +8/3, but the relative amounts of the Fe2+ and Fe3+ cause the formal oxidation state to be 8/3.



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