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SiO2

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The composition of quartz is SiO2 which means that two atoms of oxygen share one atom of silicon. It can be described as "Silicon di-oxide," and as a result it forms long hexagonal crystals which may be surmounted with a six sided pyramid. On the Mhos scale of hardness it has a hardness of 7. Varieties of quartz include flint, amethyst, rose quartz etc.

It also forms a massive variety which is often seen in metamorphic rocks, as a crystal in granites. In pure form it resembles clear glass. It has a conchoidal fracture.

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13y ago

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