<Tr> <Td_colspan="2"> Infobox references </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> </Tr> <P> iron (II, III) oxide is the chemical compound with formula Fe O. It occurs in nature as the mineral magnetite . It is one of a number of iron oxides, the others being iron (II) oxide (FeO), which is rare, and iron (III) oxide (Fe O) also known as hematite . It contains both Fe and Fe ions and is sometimes formulated as FeO ∙ Fe O . This iron oxide is encountered in the laboratory as a black powder . It exhibits permanent magnetism and is ferrimagnetic, but is sometimes incorrectly described as ferromagnetic . Its most extensive use is as a black pigment which is synthesised rather than being extracted from the naturally occurring mineral as the particle size and shape can be varied by the method of production . </P> <P> Under anaerobic conditions, ferrous hydroxide (Fe (OH)) can be oxidized by water to form magnetite and molecular hydrogen . This process is described by the Schikorr reaction: </P>

What is the difference between iron ii oxide and iron iii oxide
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