sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, gray, or clear in color, vitreous 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 white, gray, or clear in color, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through the weathering and prolonged water-action erosion of larger quartz-bearing rocks, typically granite or quartzite, often smoothed in riverbeds or marine environments over thousands to millions of years.
Uses & applications
Used in landscaping, decorative stone, aquarium gravel, and as a raw material in the manufacture of glass and silicon.
Geological facts
Quartz is one of the most abundant and durable minerals in the Earth's continental crust, highly resistant to both chemical and mechanical weathering.
Field identification & locations
Found worldwide in river gravels, beaches, and streambeds. 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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Quartz pebble
Silicon dioxide (SiO2)
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Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
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Sedimentary Sandstone
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Banded Siltstone / Mudstone Pebble
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