mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
Mohs hardness of 7; colorless or transparent; vitreous (glassy) luster; hexagonal crystal system with prismatic habit; no cleavage, exhibits conchoidal fracture; specific gravity of 2.65.
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Physical properties
Mohs hardness of 7; colorless or transparent; vitreous (glassy) luster; hexagonal crystal system with prismatic habit; no cleavage, exhibits conchoidal fracture; specific gravity of 2.65.
Formation & geological history
Forms in hydrothermal veins, pegmatites, and as a secondary mineral in sedimentary rocks from cooling silica-rich aqueous solutions over millions of years.
Uses & applications
Used in electronics (oscillators), manufacturing of glass and optics, abrasive materials, jewelry, and crystal healing or mineral collecting.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. It exhibits piezoelectric properties, meaning it can generate an electrical charge in response to mechanical stress.
Field identification & locations
Easily identified by its characteristic hexagonal crystal shape, lack of cleavage, and hardness (scratches glass). Found worldwide, with major deposits in Brazil, the USA, Madagascar, and the Alps.
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