sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white to off-white or translucent in color, vitreous to greasy luster, trigonal crystal system, lacks true cleavage and exhibits conchoidal fracture, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to off-white or translucent in color, vitreous to greasy luster, trigonal crystal system, lacks true cleavage and exhibits conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transportation (fluvial or marine erosion) of parent quartz-bearing rocks, smoothing sharp edges into a rounded pebble shape over thousands to millions of years.
Uses & applications
Used in landscaping, decorative stone, construction aggregates, glass manufacturing, and as a raw material for silicon production.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust. Its high resistance to both chemical weathering and mechanical abrasion allows it to survive long journeys in riverbeds and beaches.
Field identification & locations
Can be identified easily by its resistance to scratching by a steel knife (hardness > 5.5), smooth water-worn surface with potential small pitting or fracture lines, and common occurrence in river gravels and beaches worldwide.
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