maghemiten.
/maɡˈhiːmʌɪt/, U.S. /mæɡˈhɛmaɪt/, /ˈmæɡəˌmaɪt/ Mineralogy.
A highly ferromagnetic mineral of the spinel group which is a form of ferric oxide, Fe2O3, crystallizing in the cubic system and formed principally by alteration of magnetite.
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the world > the earth > minerals > types of mineral > oxides and hydroxides > [noun] > spinel group AB2 O4 > maghemite
maghemite1927
titanomaghemite1953
1927 P. A. Wagner in Econ. Geol. 22 846 The interesting form of ferric oxide under discussion appears to be identical in atomic structure with magnetite, but has the chemical composition and the physical properties of hematite... It is desirable that it should have a distinctive designation... I would suggest maghemite.
1944 Trans. Geol. Soc. S. Afr. 46 30 Maghemite is the commonest and most widely distributed mineral in the Bushveld magnetic iron ores.
1962 W. A. Deer et al. Rock-forming Minerals V. 73 Maghemite is metastable, and inverts to haematite (α-Fe2O3) on heating.
1978 Sci. Amer. Mar. 87/2 Maghemite is yellowish brown or reddish in color, and if it is present, it may contribute to the color of Mars.
1989 Nature 18 May 203/2 The oxidation of the original magnetite to the solid-solution endmember, maghemite, does not introduce visible crystal defects.
This entry has been updated (OED Third Edition, March 2000; most recently modified version published online March 2022).
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n.1927