mineral
Clear Quartz
Silicon Dioxide (SiO2)
Hardness: 7.0 Mohs. Color: Colorless to milky white (tumbled). Luster: Vitreous/glassy. Crystal System: Trigonal. Cleavage: None. Specific Gravity: 2.65.
- Hardness
- 7
- Color
- Colorless to milky white (tumbled)
- Luster
- Vitreous/glassy
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Physical properties
Hardness: 7.0 Mohs. Color: Colorless to milky white (tumbled). Luster: Vitreous/glassy. Crystal System: Trigonal. Cleavage: None. Specific Gravity: 2.65.
Formation & geological history
Formed through the cooling and crystallization of silica-rich hydrothermal solutions or magma in geodes and veins. Found across all geological ages.
Uses & applications
Used in electronics (oscillators), manufacturing of glass and ceramics, abrasives, jewelry (tumbled stones, beads), and as a popular collector's specimen.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Known as 'Rock Crystal', it was historically used for making lenses and crystal balls.
Field identification & locations
Identify by its hardness (scratches glass), glass-like luster, and lack of cleavage planes. Tumbled specimens like this are common in rock shops worldwide.
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