Making rocks into magnets

Lab experiments show one way that certain types of stones can morph into magnets

By Sid Perkins, 14:44 PM September 28, 2012

Heat up a rock. Most likely, all you will get is a hot rock. But heat up the right type of stone to just the right temperature and you could end up with a magnet, scientists now report.

Long before people invented the small magnets that stick to refrigerators or the big magnets that pick up cars at the junkyard, people discovered natural magnets. The most magnetic and common type is a lodestone. It consists of a brownish-black mineral called magnetite. Lodestones are natural compasses: Su...

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