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Minerals
From CopperWiki
Minerals, with the exception of mercury, are solid masses that form shapes called crystals. There are at present almost 3000 known types of minerals. Minerals vary in color, hardness, density, crystal form, crystal size, transparency, composition, location, and abundance. Some minerals are radioactive (uranophane), while others are magnetic (magnetite).
On an average almost 30 new minerals are discovered every year.
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What are minerals?
