sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, clear, or light grey in color, vitreous luster, conchoidal fracture, and no discernible cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, clear, or light grey in color, vitreous luster, conchoidal fracture, and no discernible cleavage.
Formation & geological history
Formed through mechanical weathering and water transportation of parent quartz rocks, often smoothed and rounded by river currents or wave action over thousands to millions of years.
Uses & applications
Used in landscaping, decorative gravel, aggregate in construction, and as tumbling specimens for rock collectors.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust and is exceptionally resistant to both chemical and mechanical weathering, allowing it to survive long transport as pebbles.
Field identification & locations
Commonly found in stream beds, river gravel bars, beaches, and conglomerate sedimentary rocks worldwide. Identify by its high hardness (scratches glass) and smooth, water-worn shape.
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