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maghemite
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maghemite

mineral
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Also known as: gamma-Fe2O3
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Also called:
gamma-Fe2O3
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multiple oxide
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maghemite, an iron oxide mineral. It has a composition close to ferric oxide (Fe2O3) and exhibits strong magnetism and remanence. Its structure is isometric, of defective spinel form, and somewhat iron-deficient. Maghemite is metastable with respect to hematite and forms a continuous metastable solid solution with magnetite; titanium can substitute for iron, giving rise to titanomaghemite. Natural maghemite forms by oxidation of magnetite. Synthetic maghemite, produced by dehydrating lepidocrocite or oxidizing magnetite at a low temperature, is used as a magnetic-recording medium.