mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, clear to white color, vitreous luster, hexagonal 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 color, vitreous luster, hexagonal crystal system, conchoidal fracture, 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.
Uses & applications
Used in electronics, watches, glassmaking, ceramics, abrasives, and as a gemstone or ornamental mineral.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust, surpassed only by feldspar. Its piezoelectric properties make it essential for modern electronics and timekeeping devices.
Field identification & locations
Can be identified by its distinctive conchoidal fracture, high hardness (scratches glass easily), and lack of cleavage. Found worldwide in nearly every geological setting.
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Schist
Schist
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Septarian Pebble
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sedimentary
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
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