sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale; typically white, gray, or translucent in color; vitreous luster; no true cleavage, conchoidal fracture; specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale; typically white, gray, or translucent in color; vitreous luster; no true cleavage, conchoidal fracture; specific gravity of 2.65.
Formation & geological history
Formed through the mechanical weathering and water-transportation (rounding) of quartz-rich rocks over thousands to millions of years.
Uses & applications
Used in landscaping, decorative stone, and as raw material for glassmaking and construction aggregates.
Geological facts
Quartz is one of the most abundant and durable minerals in the Earth's continental crust, making its pebbles extremely common in riverbeds and beaches.
Field identification & locations
Found worldwide in stream beds, river gravels, and marine beaches. Easily identified by its high hardness (scratches glass) and smooth, water-worn shape.
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