sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, color ranges from yellowish, cream, to translucent white, vitreous luster, conchoidal fracture, trigonal crystal system when formed in crystals but weathered smooth as a pebble, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, color ranges from yellowish, cream, to translucent white, vitreous luster, conchoidal fracture, trigonal crystal system when formed in crystals but weathered smooth as a pebble, specific gravity of 2.65.
Formation & geological history
Formed through the mechanical weathering and prolonged transport of hydrothermal veins or quartz-rich igneous and metamorphic rocks, typically deposited in rivers, beaches, or alluvial fans over millions of years.
Uses & applications
Used in landscaping, decorative gravel, aggregate in construction, glassmaking, and polished as a tumbling stone or minor gemstone.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust. Its high resistance to both chemical and mechanical weathering allows pebbles to survive countless cycles of erosion.
Field identification & locations
Found worldwide in riverbeds, beaches, and sedimentary conglomerates. Can be identified by its high hardness (scratches glass) and smooth, rounded water-worn shape.
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