sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, white and greyish coloration, 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, white and greyish coloration, vitreous to waxy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through the mechanical weathering and water transport of larger quartz veins or rocks, resulting in a smooth, rounded pebble shape due to abrasion in riverbeds or coastal environments.
Uses & applications
Commonly used in landscaping, decorative gravel, aquariums, and occasionally in tumbling or lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, highly resistant to both chemical and mechanical weathering, which allows it to survive long journeys in river systems.
Field identification & locations
Found worldwide in stream beds, beaches, and alluvial deposits. Can be identified by its high hardness (scratches glass) and smooth, water-worn shape.
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Quartz pebble
Silicon dioxide (SiO2)
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Banded Siltstone / Mudstone Pebble
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