magnetite

magnetite
/mag"ni tuyt'/, n.
a very common black iron oxide mineral, Fe3O4, that is strongly attracted by magnets: an important iron ore.
[1850-55; MAGNET + -ITE1; cf. G Magnetit]

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or lodestone or magnetic iron ore

Iron oxide mineral (Fe3O4), the chief member of one of the series of the spinel group.

Minerals in this series form black to brownish, metallic, moderately hard octahedrons and masses in igneous and metamorphic rocks and in granite pegmatites, stony meteorites, and high-temperature sulfide veins. Magnetite, as the name implies, is strongly attracted to a magnet. It is a common constituent of iron ores. Magnetite with an intrinsic magnetic field (a natural magnet) is known as lodestone.

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also called  lodestone , or  magnetic iron ore 

      iron oxide mineral (FeFe2O4, or Fe3O4) that is the chief member of one of the series of the spinel (q.v.) group. Minerals in this series form black to brownish, metallic, moderately hard octahedrons and masses in igneous and metamorphic rocks and in granite pegmatites, stony meteorites, and high-temperature sulfide veins. The magnetite series also contains magnesioferrite (magnesium iron oxide, MgFe2O4), franklinite (zinc iron oxide, ZnFe2O4), jacobsite (manganese iron oxide, MnFe2O4), and trevorite (nickel iron oxide, NiFe2O4). All are magnetic, although franklinite and jacobsite are only weakly so; magnetite, which frequently has distinct north and south poles, has been known for this property since about 500 BC. For detailed physical properties, see oxide mineral (table).

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Universalium. 2010.

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