sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, gray, or clear color, vitreous to dull luster, hexagonal crystal system when formed, 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 white, gray, or clear color, vitreous to dull luster, hexagonal crystal system when formed, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through the weathering and erosion of quartz-bearing parent rocks such as granite. Water transport in rivers or ocean waves rounds the edges over long periods, creating smooth pebbles.
Uses & applications
Used in landscaping, decorative stone, construction aggregate, and occasionally in lapidary work or rock tumbling.
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.
Field identification & locations
Found easily in stream beds, river gravels, and beaches worldwide. Identified by its high hardness (scratches glass) and smooth, water-worn shape.
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Sandstone or Siltstone
Arenite (if sandstone)
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Quartz pebble
Silicon dioxide (SiO2)
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Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
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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
Siltstone / Argillite
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