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Precious stones or gemstone is a mineral, rock, such in the case of lapis lazuli, or petrified material that when cut or faceted and polished is collectible or ...
true mineral 
www.lafda.com - 2009-02-05
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Complete, up-to-date, mineral database containing 4,442 mineral species descriptions and comprehensive picture library of images. These data are linked to ...
webmineral.com - 2009-03-07
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