sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, grey, or tan in color, vitreous to dull luster, conchoidal fracture, specific gravity around 2.65
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Physical properties
Hardness of 7 on the Mohs scale, typically white, grey, or tan in color, vitreous to dull luster, conchoidal fracture, specific gravity around 2.65
Formation & geological history
Formed through the mechanical weathering and fluvial transport of larger quartz veins or rocks, resulting in smooth, rounded pebble shapes over long periods in riverbeds or beaches.
Uses & applications
Used in landscaping, decorative stone, construction aggregates, and as raw material for glassmaking and silicon production.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering, which is why it often survives as smooth pebbles long after other minerals have broken down.
Field identification & locations
Commonly found in streambeds, riverbanks, and coastal beaches worldwide. Can be identified by its high hardness (scratches glass) and lack of cleavage.
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