mineral
Quartz (Tumbled/Water-worn)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Translucent white to pale yellow; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Translucent white to pale yellow
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Translucent white to pale yellow; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
Formation & geological history
Formed from silicon-rich hydrothermal solutions or cooling magma. This specimen appears water-worn or tumbled, suggesting it was found in a riverbed, beach, or processed by a rock tumbler.
Uses & applications
Used in jewelry, electronics (piezoelectric properties), glassmaking, and as a popular collector stone.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'Quarz', which had its origin in Slavic languages.
Field identification & locations
Identify by its hardness (it can scratch glass and steel) and lack of cleavage. Look for it in sandy areas, riverbeds, and gravel pits worldwide.
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