mineral

Quartz Pebble

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness 7 on the Mohs scale, milky white to translucent off-white color, vitreous to waxy luster, trigonal crystal structure, conchoidal fracture, specific gravity of 2.65.

Identified July 27, 2026More mineral →

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Physical properties

Hardness 7 on the Mohs scale, milky white to translucent off-white color, vitreous to waxy luster, trigonal crystal structure, conchoidal fracture, specific gravity of 2.65.

Formation & geological history

Formed in igneous pegmatites or hydrothermal veins, then eroded, transported, and rounded by fluvial or marine water action over thousands to millions of years.

Uses & applications

Commonly collected as river stones, used in landscaping, decorative stone displays, tumbling, and industrial abrasives.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Rounded quartzite and quartz pebbles are among the most durable rocks on the planet.

Field identification & locations

Can be identified in the field by its scratch resistance (scratches glass easily), lack of cleavage, and water-worn smooth shape. Extremely common worldwide in riverbeds and beaches.