gemstone
Clear Quartz (Faceted)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Colorless/transparent. Luster: Vitreous (glassy). Crystal Structure: Trigonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale. Colorless/transparent. Luster: Vitreous (glassy). Crystal Structure: Trigonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.65.
Formation & geological history
Formed in hydrothermal veins, pegmatites, and metamorphic environments from silica-rich fluid crystallization over millions of years.
Uses & applications
Used in gemstone jewelry, ornamental carvings, optical components, electronics (piezoelectric oscillators), and mineral collections.
Geological facts
Quartz is one of the most abundant minerals on Earth's crust. Ancient Greeks believed clear quartz was ice frozen so hard that it could never thaw.
Field identification & locations
Identified by its transparency, inability to be scratched by steel (hardness 7), lack of cleavage, and glassy luster. Commonly found worldwide in Brazil, Madagascar, the US, and the Alps.
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