sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white to translucent with brownish iron-staining, vitreous to waxy luster, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Identified August 4, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, typically white to translucent with brownish iron-staining, vitreous to waxy luster, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Formation & geological history

Formed through the weathering and prolonged aqueous transport of larger quartz-bearing rocks (such as granite or pegmatite), smoothing edges in rivers or marine environments over thousands to millions of years.

Uses & applications

Used in landscaping, decorative stone, abrasive manufacturing, and as tumbled stones for lapidary and crafting.

Geological facts

Quartz is one of the most abundant and durable minerals in Earth's continental crust, making up a large portion of beach sand and river pebbles.

Field identification & locations

Easily identified in the field by its high hardness (scratches glass), lack of cleavage, and smooth water-worn shape. Commonly found in riverbeds, beaches, and conglomeratic sedimentary rock formations worldwide.