mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: Creamy white to pale yellow, Luster: Vitreous to waxy (weathered), Crystal Structure: Hexagonal (trigonal), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Creamy white to pale yellow, Luster: Vitreous to waxy (weathered), Crystal Structure: Hexagonal (trigonal), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65
Formation & geological history
Formed from molten magma or hydrothermal veins, this specimen has been weathered and rounded by water transport in a river or coastal environment over thousands of years.
Uses & applications
Used in construction aggregates, glass making, abrasives, and as decorative river stones in landscaping.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Its high hardness and chemical resistance allow it to survive long-distance transport in rivers, resulting in these rounded 'river rocks'.
Field identification & locations
Identified by its ability to scratch glass and lack of reaction to acid. Common in gravel beds, shorelines, and glacial till worldwide. Collectors should look for smoothness and translucency.
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