sedimentary
Quartz pebble
Silicon dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, gray, or clear, vitreous luster, hexagonal crystal structure when unweathered, conchoidal fracture, specific gravity of 2.65
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or clear, vitreous luster, hexagonal crystal structure when unweathered, conchoidal fracture, specific gravity of 2.65
Formation & geological history
Formed through the weathering and erosion of parent rocks, followed by transport via water and deposition in sedimentary environments such as rivers or beaches over geological timescales
Uses & applications
Used in landscaping, decorative gravel, aggregate in construction, and as raw material for glassmaking
Geological facts
Quartz is one of the most abundant and durable minerals in the Earth's continental crust, highly resistant to both chemical and physical weathering
Field identification & locations
Found worldwide in riverbeds, beaches, and conglomerate rock formations; identified by its high hardness (scratches glass) and conchoidal fracture
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Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
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
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
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Sedimentary Sandstone
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