mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Mohs hardness of 7, vitreous to waxy luster, trigonal crystal system, conchoidal fracture, white to yellowish-tan color with iron staining, specific gravity around 2.65.

Identified July 24, 2026More mineral →

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Physical properties

Mohs hardness of 7, vitreous to waxy luster, trigonal crystal system, conchoidal fracture, white to yellowish-tan color with iron staining, specific gravity around 2.65.

Formation & geological history

Formed via igneous or hydrothermal processes as primary quartz, then eroded, transported by water, and rounded into a pebble in riverbeds or marine shorelines over thousands to millions of years.

Uses & applications

Commonly used in decorative landscaping, aquariums, glass manufacturing (when pure), abrasive materials, and as lapidary material for tumbling.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Rounded stream pebbles like this often exhibit natural polished surfaces due to tumbling in water currents.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and smooth water-worn surface. Found in river deposits, gravel pits, and beaches worldwide.