Mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Hardness: 7 on Mohs scale; Color: White to milky white; Luster: Vitreous to waxy; Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- White to milky white
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: White to milky white; Luster: Vitreous to waxy; Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed through the cooling of magma or precipitation from hydrothermal veins. This specific specimen is a water-worn pebble, likely eroded from a larger vein and smoothed by transport in a river or coastal environment.
Uses & applications
Used widely in glassmaking, electronics (as oscillators), abrasives, and as a common decorative stone in landscaping or jewelry (as 'milky quartz').
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. It is piezoelectric, meaning it generates an electric charge in response to applied mechanical stress.
Field identification & locations
Identify in the field by its hardness (it will scratch glass) and lack of cleavage. Common in riverbeds, beaches, and gravel pits worldwide.
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