sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white or translucent with dark mineral inclusions, 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 or translucent with dark mineral inclusions, 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 water-tumbles of quartz-rich rocks in riverbeds, beaches, or glacial environments over millions of years.
Uses & applications
Used in decorative landscaping, tumbling, lapidary arts, and as collector specimens.
Geological facts
Quartz is one of the most abundant minerals on Earth's continental crust and is exceptionally resistant to both chemical and physical weathering, which is why it commonly survives as pebbles.
Field identification & locations
Easily identified by its high hardness (scratches glass) and smooth, rounded water-worn shape found frequently in gravel bars, beaches, and stream beds.
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