mineral
Clear Quartz (Facet Cut / Polished)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Colorless and transparent. Luster: Vitreous (glassy). Crystal Structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Colorless and transparent
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale. Color: Colorless and transparent. Luster: Vitreous (glassy). Crystal Structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.
Formation & geological history
Formed in hydrothermal veins, pegmatites, and metamorphic rocks under wide temperature and pressure conditions through crystallization of silica-rich fluids.
Uses & applications
Used extensively in jewelry, faceted gemstones, paperweights, decorative ornaments, crystal healing, optics, and electronics (piezoelectric oscillators).
Geological facts
Clear Quartz is also known as Rock Crystal. The word 'crystal' comes from the Greek word 'krystallos', meaning ice, as ancient Greeks believed quartz was ice frozen permanently hard.
Field identification & locations
Identified by its transparency, vitreous luster, hexagonal crystal habits when raw, and ability to scratch glass easily (Mohs 7). Found worldwide in places like Brazil, Madagascar, and Arkansas, USA.
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