Quartz

Quartz is a hard mineral composed of silica (silicon dioxide). Its atoms are linked in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen atom being shared between two tetrahedra, giving an overall chemical formula of SiO2. Therefore, quartz is classified structurally as a framework silicate mineral and compositionally as an oxide mineral.

Quartz is the second most common mineral or mineral group in Earth's lithosphere, comprising about 12% by mass.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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