sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 Mohs; waxy to vitreous luster; trigonal crystal system; no cleavage; tan to yellowish-brown with a smooth, rounded surface.
- Hardness
- 7 Mohs
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Physical properties
Hardness: 7 Mohs; waxy to vitreous luster; trigonal crystal system; no cleavage; tan to yellowish-brown with a smooth, rounded surface.
Formation & geological history
Formed as crystalline quartz within igneous or metamorphic veins, then weathered, transported, and water-worn by fluvial or marine action.
Uses & applications
Commonly used in landscaping, aggregate, tumbling for lapidary crafts, and raw quartz sourcing for abrasives.
Geological facts
Stream-tumbled quartz pebbles can endure millions of years of mechanical abrasion due to quartz's high chemical stability and hardness.
Field identification & locations
Identified by lack of cleavage, ability to scratch glass (Mohs 7), and smooth, rounded water-worn exterior; extremely common in riverbeds and gravel bars worldwide.
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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