sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, clear, or off-white with some weathered staining, vitreous to dull luster, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, clear, or off-white with some weathered staining, vitreous to dull luster, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed through the weathering and prolonged water transport of quartz-rich rocks (such as granite or quartzite) in riverbeds, beaches, or alluvial deposits over geological time scales.
Uses & applications
Used in landscaping, as decorative gravel, in concrete aggregates, and by rock collectors.
Geological facts
Quartz is one of the most abundant and durable minerals in the Earth's continental crust, making its pebbles extremely resistant to physical and chemical weathering.
Field identification & locations
Can be identified in the field by its high hardness (scratches glass), lack of cleavage, and smooth, rounded shape resulting from aqueous tumbling. Found globally in streambeds and sedimentary deposits.
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Sandstone or Siltstone
Arenite (if sandstone)
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Quartz pebble
Silicon dioxide (SiO2)
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Septarian Concretion containing Brachiopods/Crinoids
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Generic Pebble / Rock Fragment
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Sedimentary Sandstone
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Banded Siltstone / Mudstone Pebble
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