sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white or translucent grey, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Identified August 2, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, typically white or translucent grey, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Formation & geological history

Formed through the mechanical weathering and water transport (river or wave action) of larger quartz veins, pegmatites, or metamorphic rocks over thousands to millions of years, resulting in a smooth, rounded pebble shape.

Uses & applications

Used in landscaping, decorative gravel, garden pathways, aquariums, and occasionally in lapidary work or tumbled stone crafts.

Geological facts

Quartz is one of the most abundant and durable minerals on Earth's continental crust. Its high resistance to chemical weathering allows it to survive long journeys in riverbeds and beaches where softer minerals erode away.

Field identification & locations

Found worldwide in stream beds, river gravel bars, and beaches. Easily identified in the field by its high hardness (scratches glass), lack of cleavage, and smooth water-worn surface.