lodestone

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lodestone:

see magnetitemagnetite
, 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.
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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
References in classic literature ?
This loadstone is under the care of certain astronomers, who, from time to time, give it such positions as the monarch directs.
And the king, when he is highest provoked, and most determined to press a city to rubbish, orders the island to descend with great gentleness, out of a pretence of tenderness to his people, but, indeed, for fear of breaking the adamantine bottom; in which case, it is the opinion of all their philosophers, that the loadstone could no longer hold it up, and the whole mass would fall to the ground.
As Plume explains, then, the "main part" of recruiting entails seducing women: "the Women, you know, are the Loadstones everywhere--gain the Wives, and you're caress'd by the Husbands; please the Mistresses, and you are valu'd by their Gallants .
The "most mountainous oppression" exerted by the masterpieces of the "giant" predecessors indeed became Bloom's province of research, whose purpose was a world mapping of all the cultural and literary gold nuggets and veins and loadstones that with the passage of time came to light naturally, and were then transferred from place to place, from author to author, at times through "noble contagion" being enhanced in value and power, at other times, through "falling into a ditch," being diminished and weakened, but at all times gradually and inescapably building up the canon, i.e.
One of Thompson's favourite and most frequently-quoted references to Gilbert came from a John Dryden poem that celebrated English scientific prowess: "Gilbert shall live, till loadstones cease to draw,/ Or British fleets the boundless ocean awe." (80) This couplet suggested that there was a transcendental connection between Gilbert, magnetism, and British maritime power, which was of course just as much a source of pride and confidence in 1900 as it had been in 1600.
were the Loadstones that Attracted them." (76) At Lancaster, Pennsylvania, Thomas Pendible, who was suspected of "making counterfeit pieces of Eight," fled from the 50th Regiment in the company of "a tall lusty woman" named Jane.