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lodestone |
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lodestone: see magnetite magnetite (măg`nətīt), lustrous black, magnetic mineral, Fe3O4. ..... Click the link for more information. . magnetiteor lodestone or magnetic iron oreIron 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. lodestone, loadstone a. a rock that consists of pure or nearly pure magnetite and thus is naturally magnetic b. a piece of such rock, which can be used as a magnet and which was formerly used as a primitive compass |
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