sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale; color ranges from translucent yellow, brown, to clear; vitreous to waxy 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; color ranges from translucent yellow, brown, to clear; vitreous to waxy luster; trigonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transportation of parent igneous or metamorphic rocks, typically found in riverbeds, beaches, and alluvial deposits.
Uses & applications
Used in landscaping, decorative gravel, aggregate in construction, and occasionally in lapidary arts for tumbling and cabochons.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, surviving weathering processes that destroy other minerals.
Field identification & locations
Identified by its high hardness (scratches glass), lack of cleavage, and smooth water-worn shape. Commonly found worldwide in streams and shorelines.
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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