mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, white to translucent with orange-brown iron oxide staining, vitreous luster, trigonal crystal system, conchoidal fracture, no cleavage, specific gravity of 2.65.

Identified August 3, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, white to translucent with orange-brown iron oxide staining, vitreous luster, trigonal crystal system, conchoidal fracture, no cleavage, specific gravity of 2.65.

Formation & geological history

Formed via the weathering and erosion of various parent rocks, commonly quartz veins or pegmatites. The smooth, rounded shape is the result of water transport and abrasion in a river, stream, or beach environment over thousands to millions of years.

Uses & applications

Used primarily as decorative landscape gravel, in landscaping, abrasive materials, glass manufacturing, and as a popular find for amateur rockhounds and jewelry making.

Geological facts

Quartz is one of the most abundant minerals in Earth's continental crust. The orange staining on this specific specimen is typically caused by iron oxide (rust) seeping into micro-fractures during weathering.

Field identification & locations

Easily identified by its high hardness (scratches glass), lack of cleavage, and resistance to chemical weathering, making it persist long after softer minerals have worn away. Found worldwide in riverbeds, beaches, and glacial deposits.