sedimentary
Quartz pebble
Silicon dioxide (SiO2)
Hardness of 7 on the Mohs scale, white to clear color with some iron staining, vitreous luster, conchoidal fracture, specific gravity of 2.65
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Physical properties
Hardness of 7 on the Mohs scale, white to clear color with some iron staining, vitreous luster, conchoidal fracture, specific gravity of 2.65
Formation & geological history
Formed through the weathering and erosion of parent rocks, resistant quartz survives transport in streams and rivers to become rounded pebbles in sedimentary deposits.
Uses & applications
Used in landscaping, decorative gravel, aggregate in construction, and glass manufacturing.
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 stream beds, beaches, and sedimentary formations; easily identified by its high hardness, lack of cleavage, and resistance to scratching by a steel nail.
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Sandstone or Siltstone
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Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
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Quartz pebble
Silicon dioxide (SiO2)
sedimentary
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Banded Siltstone / Mudstone Pebble
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