mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, clear to white or milky color, 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, clear to white or milky color, 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, glassware, abrasives, gemstones, and construction materials.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and exhibits piezoelectric properties, meaning it can generate an electric charge under mechanical stress.
Field identification & locations
Easily identified by its distinct hardness (scratches glass) and conchoidal fracture. Found worldwide in nearly every type of rock formation.
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Schist
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