sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically gray, white, or translucent with a vitreous to dull luster, conchoidal fracture, and specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically gray, white, or translucent with a vitreous to dull luster, conchoidal fracture, and specific gravity around 2.65.
Formation & geological history
Formed through the mechanical weathering and water transport of larger quartz veins or rocks, resulting in smoothing through abrasion in rivers, streams, or coastal environments over geological timescales.
Uses & applications
Commonly used in landscaping, decorative stone, construction aggregate, and by amateur rock collectors.
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 which allows pebbles to persist long after other minerals have eroded away.
Field identification & locations
Found worldwide in riverbeds, beaches, and sedimentary deposits. Easily identified by its high hardness (scratches glass) and lack of cleavage.
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Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
Arenite (if sandstone)
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Sandstone
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Shale
Shale (clastic sedimentary rock)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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