sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically gray, white, or translucent, 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 gray, white, or translucent, vitreous to waxy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through weathering and prolonged water erosion of quartz-bearing rocks like granite or quartzite, often shaped into smooth pebbles by wave action in beaches or rivers over thousands to millions of years.
Uses & applications
Used in landscaping, decorative stone, construction aggregate, and glassmaking.
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 worldwide in riverbeds, beaches, and glacial outwash. Easily 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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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
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
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Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
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