sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically yellowish-brown or translucent white in 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 yellowish-brown or translucent white in color, 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 prolonged aqueous transport of larger quartz veins or igneous/metamorphic rocks, smoothing edges in riverbeds or marine environments.
Uses & applications
Used in landscaping, decorative stone, tumbling, and as a raw material for silicon and glass production.
Geological facts
Quartz is one of the most abundant minerals on Earth's continental crust and is exceptionally resistant to weathering both chemically and physically.
Field identification & locations
Can be identified in the field by its high hardness (scratches glass), conchoidal fracture, and lack of reaction to acid. Commonly found in river gravels, beaches, and conglomerate rock formations.
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Arenite (if sandstone)
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Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
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Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
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Sedimentary Sandstone
Arenite (Sedimentary Rock)
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Banded Siltstone / Mudstone Pebble
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