sedimentary
Quartz Pebbles
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, colors range from clear, white, grey to tan, 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, colors range from clear, white, grey to tan, 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 erosion of various parent rocks, commonly quartz veins or granites, followed by transport in water streams which rounds the edges into pebbles.
Uses & applications
Used in landscaping, construction aggregates, decorative gravel, and occasionally tumbling or lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals on Earth's continental crust, highly resistant to both chemical and mechanical weathering, which allows quartz pebbles to survive long transport distances in rivers and oceans.
Field identification & locations
Found worldwide in riverbeds, beaches, and alluvial deposits; identified easily by its high hardness (scratches glass) and conchoidal fracture.
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