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Trade Terminology

Lodestone or loadstone refers to either:

Iron, steel and ordinary magnetite are attracted to a magnetic field, including the Earth's magnetic field. Only magnetite with a particular crystalline structure, lodestone, can act as a natural magnet and attract and magnetize iron. Originaly lodestone was found in a place called Magnesia.

In China, the earliest literary reference to magnetism lies in a 4th century BC book called Book of the Devil Valley Master (???): "The lodestone makes iron come or it attracts it." The earliest mention of the attraction of a needle appears in a work composed between 20 and 100 AD (Louen-heng): "A lodestone attracts a needle." By the 12th century the Chinese were known to use the lodestone compass for navigation.

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