Iron(II,III) oxide | Wikipedia audio article
Channel: wikipedia tts
Date: 20/10/2018

This is an audio version of the Wikipedia Article:
Iron(II,III) oxide

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SUMMARY
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Iron(II,III) oxide is ferrous oxide, the chemical compound with formula Fe3O4. 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 (Fe2O3) which is ferric oxide, also known as hematite or rust. It contains both Fe2+ and Fe3+ ions and is sometimes formulated as FeO ∙ Fe2O3. 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.