sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white or translucent with yellowish iron-staining, vitreous luster, trigonal crystal system, no cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or translucent with yellowish iron-staining, vitreous luster, trigonal crystal system, no cleavage, specific gravity of 2.65.
Formation & geological history
Formed through the mechanical weathering and water-transport of larger quartz-bearing rocks (like granite or pegmatite) over long periods, resulting in rounded sedimentary pebbles found in streams, rivers, and beaches.
Uses & applications
Used in landscaping, decorative gravel, aggregate in construction, and occasionally in lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, surviving weathering processes that destroy other minerals.
Field identification & locations
Easily identified by its high hardness (scratches glass) and conchoidal fracture. Common worldwide in riverbeds and coastal areas.
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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
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Sedimentary Sandstone
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Banded Siltstone / Mudstone Pebble
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