mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale; white, translucent, or light tan color; vitreous to waxy luster; trigonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.

Identified August 5, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale; white, translucent, or light tan color; vitreous to waxy luster; trigonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.

Formation & geological history

Formed through precipitation from silica-rich solutions or as a primary component of igneous, metamorphic, and sedimentary rocks. Over millions of years, weathering and wave action have eroded and tumbled the quartz into a smooth, rounded pebble.

Uses & applications

Used in landscaping, decorative stone, production of silicon and glass, and as a popular specimen for amateur rock collectors.

Geological facts

Quartz is one of the most abundant and durable minerals in Earth's continental crust. Its high resistance to chemical and mechanical weathering allows it to survive long transport cycles in rivers and marine environments.

Field identification & locations

Easily identified by its hardness (it can scratch glass), lack of cleavage, and smooth water-worn shape found frequently in riverbeds, beaches, and glacial till. Collectors can simply look for durable, smooth stones along waterways or coastlines.