sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, gray, or transparent/translucent, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity of around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or transparent/translucent, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity of around 2.65.
Formation & geological history
Formed through the weathering and erosion of parent rocks containing quartz (such as granite or quartzite), followed by transportation via rivers or streams where water action smooths and rounds the edges into a pebble.
Uses & applications
Used in landscaping, decorative stone, abrasive manufacturing, and as a raw material for glass and silicon production.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, making quartz pebbles extremely common in riverbeds and beaches worldwide.
Field identification & locations
Easily identified by its high hardness (it can scratch glass and cannot be scratched by a steel knife) and smooth, water-worn shape. Commonly found in streambeds, gravel bars, and ancient sedimentary conglomerates.
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Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary