mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Milky white to translucent tan; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Milky white to translucent tan
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white to translucent tan; 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 weather-worn into a smooth pebble shape through water transport in a river or beach environment over thousands of years.
Uses & applications
Used in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative landscaping gravel.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to chemical and physical weathering, which is why it often remains as pebbles after other minerals have eroded away.
Field identification & locations
Identify by its ability to scratch glass and its lack of cleavage. Look for it in stream beds, beaches, and gravel pits globally.
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
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Green Apatite on Albite
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mineral