mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Tan to off-white; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Tan to off-white
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan to off-white; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
Formation & geological history
Formed from cooling magma or hydrothermal veins. This specific specimen has been rounded by fluvial or marine erosion (water action).
Uses & applications
Quartz is used in glassmaking, electronics (oscillators), abrasives, and as a semi-precious gemstone in jewelry.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'Quarz' which has Slavic origins.
Field identification & locations
Identify by its hardness (it can scratch glass and steel) and lack of cleavage. Often found in riverbeds, beaches, and gravel deposits worldwide.
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