mineral
Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale. Color is typically white, milky, or colorless. Luster is vitreous to greasy. Crystal structure is trigonal. Conchoidal fracture with no true cleavage. Specific gravity is 2.65.
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Physical properties
Hardness of 7 on the Mohs scale. Color is typically white, milky, or colorless. Luster is vitreous to greasy. Crystal structure is trigonal. Conchoidal fracture with no true cleavage. Specific gravity is 2.65.
Formation & geological history
Forms in a wide variety of geological environments, most commonly as a primary mineral in igneous rocks like granite, in hydrothermal veins, and as detrital grains in sedimentary rocks.
Uses & applications
Used in glassmaking, electronics, oscillators, abrasives, gemstones, and decorative items.
Geological facts
Quartz is one of the most abundant and widely distributed minerals on the Earth's surface. It exhibits piezoelectric properties, meaning it can generate an electrical charge in response to mechanical stress.
Field identification & locations
Easily identified by its hardness (scratches glass easily), conchoidal fracture, and lack of cleavage. Found worldwide in almost every geological setting.
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Schist
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Metamorphic
Potassium Feldspar (Orthoclase)
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mineral