sedimentary
Quartz pebble
Quartz (SiO2)
Hardness of 7 on the Mohs scale, typically translucent to opaque greyish-white color, vitreous to waxy 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, typically translucent to opaque greyish-white color, vitreous to waxy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through mechanical weathering and aqueous transport of primary igneous or metamorphic quartz veins or rocks, rounding into a pebble over millions of years in riverbeds or coastal environments.
Uses & applications
Used in landscaping, decorative gravel, historical primitive stone tools, and occasionally lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust, highly resistant to both chemical and mechanical weathering, which allows quartz pebbles to survive long journeys in river systems.
Field identification & locations
Found worldwide in stream beds, beaches, and glacial tills. Can be identified by its high hardness (scratches glass), lack of cleavage, and smooth, water-worn shape.
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