sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, white or off-white color, vitreous to dull luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, white or off-white color, vitreous to dull luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed through the mechanical weathering and water transport of larger quartz rocks or veins, typically found in riverbeds, beaches, and alluvial deposits over thousands to millions of years.
Uses & applications
Used in landscaping, decorative gravel, aquariums, and occasionally in abrasive manufacturing or glassmaking if gathered in bulk.
Geological facts
Quartz is one of the most abundant and durable minerals in the Earth's continental crust. Its high resistance to chemical and physical weathering allows it to survive long journeys in river systems, resulting in smooth, rounded pebbles.
Field identification & locations
Can be identified in the field by its high hardness (scratches glass) and lack of reactivity to acid. Common worldwide in almost any gravel bar, stream, or beach.
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