mineral
Quartz Crystal
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, clear to white color, vitreous 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, clear to white color, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Forms mainly in hydrothermal veins, pegmatites, and as a primary constituent of igneous, metamorphic, and sedimentary rocks over millions of years.
Uses & applications
Used in electronics (oscillators), optical instruments, glass manufacturing, abrasives, and as a popular gemstone and collector mineral.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and exhibits piezoelectric properties, meaning it can generate an electrical charge when compressed.
Field identification & locations
Easily identified by its characteristic 7 Mohs hardness (can scratch glass) and conchoidal fracture. Found worldwide in almost every geological environment.
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