mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Identified July 31, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through crystallization from silica-rich magmas and hydrothermal veins, or through the weathering and water-transport of quartz-bearing rocks over millions of years into smooth, rounded pebbles.

Uses & applications

Used in landscaping, decorative gravel, glassmaking, abrasive manufacture, and occasionally tumbled or carved for jewelry.

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 in rivers and oceans, commonly ending up as smooth quartz pebbles.

Field identification & locations

Easily identified in the field by its high hardness (scratches glass easily), lack of cleavage, and resistance to acid. Found worldwide in riverbeds, beaches, and glacial deposits.