sedimentary
Quartz pebble
Silicon dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, clear, or greyish in color, vitreous luster, conchoidal fracture, specific gravity of 2.65
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Physical properties
Hardness of 7 on the Mohs scale, typically white, clear, or greyish in color, vitreous luster, conchoidal fracture, specific gravity of 2.65
Formation & geological history
Formed through weathering and water transport of quartz veins or intrusive igneous rocks, often deposited in riverbeds and beaches over millions of years
Uses & applications
Commonly used in landscaping, road construction, decorative gravel, and lapidary practice
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust and is exceptionally resistant to both chemical and mechanical weathering
Field identification & locations
Can be identified in the field by its high hardness (scratches glass), lack of cleavage, and smooth, water-worn shape. Found worldwide in stream beds, gravel bars, and sedimentary deposits
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Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary