mineral
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, yellowish to clear color due to iron staining, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, yellowish to clear color due to iron staining, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through the weathering and prolonged aqueous transport of quartz veins or granitic rocks, smoothing the edges into a pebble over millions of years.
Uses & applications
Used in landscaping, decorative gravel, tumbling, and as a raw material for silicon and glass production.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering and chemical breakdown, which is why it commonly survives as pebbles in rivers and beaches.
Field identification & locations
Easily identified by its hardness (scratches glass), lack of cleavage, and glassy appearance. Found worldwide in riverbeds, beaches, and glacial tills.
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