mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, vitreous to greasy luster, variable colors (often milky, grey, yellowish, or colorless), trigonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous to greasy luster, variable colors (often milky, grey, yellowish, or colorless), trigonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity of 2.65.
Formation & geological history
Forms in a wide variety of geological environments including igneous, metamorphic, and sedimentary rocks. Often crystallizes from silica-rich hydrothermal solutions or melts.
Uses & applications
Used in electronics, manufacturing of glass, abrasives, gemstone carvings, and as decorative mineral specimens.
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
Easily identified by its hardness (scratches glass), lack of cleavage, and conchoidal fracture. Found worldwide in nearly every geological setting.
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