mineral
Quartz Crystal
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, transparent to translucent, vitreous luster, trigonal crystal system with hexagonal prisms, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, transparent to translucent, vitreous luster, trigonal crystal system with hexagonal prisms, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Forms primarily from hydrothermal solutions in pegmatites, veins, and cavities in various rock types over millions of years.
Uses & applications
Used in electronics, oscillators, watches, glassmaking, and frequently as a gemstone or specimen for mineral collectors.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust and exhibits piezoelectric properties, meaning it can generate an electrical charge under mechanical stress.
Field identification & locations
Identified by its distinct crystal shape, high hardness (scratches glass), and lack of cleavage. Found globally in almost all geological environments.
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Schist
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Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral