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A mineral is a naturally occuring inorganic solid substance that
has a definite chemical composition. Minerals are characterized
by their crystalline structure, color, and hardness.
Rocks
are composed of minerals. Quartz is one of the most abundant minerals
on earth. Other common minerals found in the crust are olivine,
pyroxene, amphibole, mica, and feldspar.
Look
at the chart to the left to see how common minerals measure up.
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