Lodestone

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Lodestone

A variety of magnetite that possesses magnetic polarity.
References in periodicals archive ?
They first used a lodestone or natural magnetised iron ore.
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.
Chinese magicians began making compasses out of lodestones in all different shapes, like turtles and fish.
Being a physician, he also examined medical claims, finding them equally illusory: "The application of lodestones to all sorts of headaches no more cures them (as some make out) than would an iron helmet or a steel cap.
At the start they were lodestones, were miraculous.