sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically yellowish-brown to translucent in color due to iron staining, vitreous to dull luster, conchoidal fracture, trigonal crystal system when formed well.
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Physical properties
Hardness of 7 on the Mohs scale, typically yellowish-brown to translucent in color due to iron staining, vitreous to dull luster, conchoidal fracture, trigonal crystal system when formed well.
Formation & geological history
Formed through weathering and water transport of quartz veins or igneous/metamorphic rocks, often rounded over long periods in riverbeds or marine environments.
Uses & applications
Used in landscaping, decorative gravel, aggregate in construction, and lapidary work.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to both chemical and mechanical weathering.
Field identification & locations
Easily identified by its high hardness (scratches glass) and resistance to weathering. Found worldwide in stream beds, beaches, and sedimentary deposits.
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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
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary