BRIEF: What are rare earth metals?

From: San Jose Mercury News (San Jose, CA) | Date: August 10, 2007 | Copyright information

Aug. 10--RARE EARTH METALS

Rare earth metals are used in a wide range of industrial applications, from cell phone batteries to technologies in the aerospace industry.

Iron gray to silvery lustrous, the metals got their name in the late 1800s, when they were believed to be scarce. It is now known that they are abundant in the Earth's crust.

What is rare is their occurrence in quantities sufficient to make them economically feasible to extract. Calif...

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