gemstone
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Hardness: 7 Mohs; Color: Colorless/transparent; Luster: Vitreous; Crystal System: Trigonal; Fracture: Conchoidal; Specific Gravity: 2.65
- Hardness
- 7 Mohs
- Color
- Colorless/transparent
- Luster
- Vitreous
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Physical properties
Hardness: 7 Mohs; Color: Colorless/transparent; Luster: Vitreous; Crystal System: Trigonal; Fracture: Conchoidal; Specific Gravity: 2.65
Formation & geological history
Formed in igneous, metamorphic, and sedimentary environments through hydrothermal activity or crystallization from magma, frequently occurring in pegmatites and veins.
Uses & applications
Used in gemstone jewelry, frequency control in electronics (piezoelectric properties), glassmaking, and metaphysical collections.
Geological facts
Clear quartz is one of the most abundant minerals in Earth's crust; the name 'crystal' comes from the Greek word 'krystallos,' meaning ice.
Field identification & locations
Identified by its ability to scratch glass, its hexagonal crystal habit in the field, and its lack of cleavage. Found globally, especially in Brazil and Arkansas, USA.
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