sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white, gray, or clear in color, vitreous to dull luster, conchoidal fracture, no distinct cleavage, specific gravity of 2.65.

Identified July 30, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, typically white, gray, or clear in color, vitreous to dull luster, conchoidal fracture, no distinct cleavage, specific gravity of 2.65.

Formation & geological history

Formed through mechanical weathering and aqueous transport of primary quartz-bearing rocks, commonly found in riverbeds, beaches, and conglomerate formations over millions of years.

Uses & applications

Used in landscaping, decorative aggregates, glassmaking, and abrasive materials.

Geological facts

Quartz is one of the most abundant and durable minerals in the Earth's continental crust, highly resistant to both chemical and mechanical weathering.

Field identification & locations

Easily identified by its high hardness (scratches glass) and lack of cleavage; commonly found worldwide in gravel bars, riverbeds, and sedimentary deposits.