Lodestone

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Lodestone

A variety of magnetite that possesses magnetic polarity.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
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The name "magnet" may come from lodestones found in Magnesia.
Inside the Imperial Academy of Sorcery, Ileni accesses the power held by lodestones, even after discovering that this power has been wrenched from others through death.
Lodestones and magnetism were first mentioned in China in about 350 BC but it was hundreds of years before there was reference to a lodestone attracting a needle (80 AD).
Chapter by chapter, the author walks readers through the history of studying Earth's magnetic field, from the ancient Greeks' fascination with natural magnets called lodestones to today's supercomputer simulations of field-generating processes in the planet's core.