mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, transparent to opaque, vitreous luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65
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Physical properties
Hardness of 7 on the Mohs scale, transparent to opaque, vitreous luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65
Formation & geological history
Forms in a wide variety of geological environments, commonly crystallizing from silica-rich hydrothermal veins and magma chambers, as well as precipitating in sedimentary environments.
Uses & applications
Used in electronics, manufacturing of glass, gemstones, and oscillators.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust, coming after feldspar.
Field identification & locations
Easily identified by its high hardness (scratches glass) and conchoidal fracture. Found worldwide in almost every rock type.
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