sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, various colors due to impurities (commonly grey, white, or clear), vitreous luster, conchoidal fracture, trigonal crystal system, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, various colors due to impurities (commonly grey, white, or clear), vitreous luster, conchoidal fracture, trigonal crystal system, specific gravity of 2.65.
Formation & geological history
Formed through the weathering and erosion of parent rocks containing quartz, followed by transport and rounding by water in rivers, streams, or coastal environments over millions of years.
Uses & applications
Used in landscaping, decorative stone, and as a raw material in aggregate for construction.
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 (scratches glass), lack of cleavage, and smooth, rounded shape caused by water transport. Found globally in alluvial deposits.
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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
Sedimentary Sandstone
Arenite (Sedimentary Rock)
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Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary