mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, commonly colorless or white but can vary, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, commonly colorless or white but can vary, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Forms in a wide variety of geological environments, frequently crystallizing from silica-rich hydrothermal veins, pegmatites, and as a primary component of igneous, metamorphic, and sedimentary rocks.
Uses & applications
Used in electronics, oscillators, glassmaking, abrasives, gemstone carvings, and decorative items.
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 electrical charge under mechanical stress.
Field identification & locations
Identified by its high hardness (scratches glass), conchoidal fracture, and lack of cleavage. Found worldwide in virtually all geological settings.
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