mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, white to off-white color with minor yellowish staining, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65.

Identified July 28, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, white to off-white color with minor yellowish staining, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65.

Formation & geological history

Formed via weathering and water-transport of quartz-bearing parent rocks over geological timescales, resulting in a rounded pebble shape.

Uses & applications

Used in decorative landscaping, garden paths, abrasive materials, and aggregate in construction.

Geological facts

Quartz is one of the most abundant minerals in the Earth's continental crust. Its high resistance to weathering allows it to survive long journeys in rivers and streams, forming smooth pebbles.

Field identification & locations

Can be identified in the field by its high hardness (scratches glass) and smooth, water-worn shape. Found globally in riverbeds, beaches, and glacial deposits.