Quartz is a chemical compound consisting of one part silicon and two parts oxygen. It is silicon dioxide (Si02). It is the most abundant mineral found at Earth's surface and its unique properties make it one of the most useful natural substances. Quartz is the second most common mineral in the Earth's continental crust. It is made up of a lattice of silica (SiO) tetrahedra.
Quartz goes by an array of different names. The most important distinction between types of quartz is that of macrocrystalline (individual crystals visible to the unaided eye) and the microcrystalline or cryptocrystalline varieties (aggregates of crystals visible only under high magnification).
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