sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, clear, or brownish due to weathering, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, clear, or brownish due to weathering, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through the weathering and prolonged aqueous erosion of quartz-bearing parent rocks such as granite or quartzite. Over long periods, river or ocean transport rounds the fragments into smooth pebbles.
Uses & applications
Used in landscaping, decorative gravel, aggregate in construction, and occasionally in lapidary arts or as tumbled stones.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust. Its high resistance to both chemical weathering and mechanical abrasion allows it to survive long transport cycles where other minerals break down.
Field identification & locations
Found worldwide in stream beds, beaches, and ancient sedimentary conglomerates. Readily 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
fossil
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
Arenite (Sedimentary Rock)
sedimentary