mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, clear, or milky in appearance, vitreous to greasy 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, typically white, clear, or milky in appearance, vitreous to greasy 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 including igneous, metamorphic, and sedimentary rocks. Often crystallizes from silica-rich hydrothermal veins and pegmatites, as well as precipitating in sedimentary environments.
Uses & applications
Widely used in electronics, oscillators, glassmaking, abrasive materials, gemstone carving, and ornamental jewelry.
Geological facts
Quartz is one of the most abundant and widely distributed minerals found on Earth's continental crust. Its piezoelectric properties make it extremely useful in electronic devices for precise frequency control.
Field identification & locations
Easily identified by its high hardness (scratches glass), lack of cleavage, and conchoidal fracture. Found worldwide in almost every geological setting.
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