sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically yellowish-brown due to iron oxide staining, vitreous to greasy luster, trigonal crystal system when formed, lacks cleavage, and has a specific gravity of around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically yellowish-brown due to iron oxide staining, vitreous to greasy luster, trigonal crystal system when formed, lacks cleavage, and has a specific gravity of around 2.65.
Formation & geological history
Formed through the weathering and prolonged water-action (river or wave erosion) of quartz-bearing parent rocks such as granite or quartz veins, often over millions of years in sedimentary environments like beaches or riverbeds.
Uses & applications
Used in landscaping, decorative gravel, construction aggregates, and occasionally lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust. Its high resistance to chemical weathering allows it to survive long transport distances where other minerals wear away.
Field identification & locations
Easily identified in the field by its high hardness (it can scratch glass and steel), lack of cleavage, and smooth water-worn shape found abundantly in river gravels and beaches.
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Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary