lodestone


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magnetite

magnetite (măgˈnətīt), lustrous black, magnetic mineral, Fe3O4. It occurs in crystals of the cubic system, in masses, and as a loose sand. It is one of the important ores of iron (magnetic iron ore) and is a common constituent of igneous and metamorphic rocks. It is found in Norway, Sweden, the Urals, and various parts of the United States. A variety of magnetite, lodestone (or loadstone) exhibits polarity and is especially interesting for its natural magnetism; Magnet Cove, Ark., became famous as a source.
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lodestone

[′lōd‚stōn]
(mineralogy)
The naturally occurring magnetic iron oxide, or magnetite, possessing polarity, and attracting iron objects to itself. Also known as Hercules stone; leading stone; loadstone.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
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They first used a lodestone or natural magnetised iron ore.
A few pointers; Maritime Tales by Stephen Guy of Merseyside Maritime Museum

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