sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white or translucent in color, vitreous luster, trigonal crystal system, conchoidal fracture with no distinct cleavage, and specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or translucent in color, vitreous luster, trigonal crystal system, conchoidal fracture with no distinct cleavage, and specific gravity of 2.65.
Formation & geological history
Formed through the mechanical weathering and prolonged aqueous transport of quartz-bearing parent rocks such as granite or quartzite, rounding the edges into a pebble over millions of years.
Uses & applications
Used in landscaping, decorative gravel, aggregate for construction, and glass manufacturing.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, highly resistant to both chemical and mechanical weathering.
Field identification & locations
Found abundantly in riverbeds, beaches, and conglomerate sedimentary rock formations worldwide; identified by its high hardness (scratches glass) and smooth, water-worn shape.
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