sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale, Color: White to off-white, Luster: Vitreous to dull due to weathering, Crystal Structure: Trigonal (microcrystalline or massive in pebble form), Cleavage: None, Specific Gravity: 2.65

Identified August 4, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the mechanical weathering and water transport of larger quartz veins or rocks, smoothing out rough edges in riverbeds or marine environments over thousands to millions of years.

Uses & applications

Used in landscaping, decorative gravel, historical stone tools, and as aggregate in construction.

Geological facts

Quartz is one of the most abundant minerals in the Earth's continental crust. Its high resistance to both chemical and physical weathering allows quartz pebbles to survive long journeys in river systems where other rocks break down.

Field identification & locations

Can be identified in the field by its hardness (scratches glass), lack of cleavage, and smooth, rounded water-worn shape. Commonly found in stream beds, beaches, and alluvial gravel deposits worldwide.