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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Mineral
Volume % of Crust
Olivine
1.5
4.0
Mica
4.0
5.0
18.0
64.0
TOTAL
96.5

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