sedimentary

Quartz Pebble

Silicon dioxide (SiO2)

Hardness of 7 on the Mohs scale, color ranges from yellowish-brown to clear, vitreous to dull luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Identified August 7, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, color ranges from yellowish-brown to clear, vitreous to dull luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Formation & geological history

Formed through the weathering and erosion of parent rocks containing quartz (such as granite or quartzite), followed by transportation in water streams where it becomes rounded, and eventual deposition in sedimentary environments.

Uses & applications

Used in landscaping, decorative gravel, aquarium substrates, and occasionally tumbled for jewelry or lapidary crafts.

Geological facts

Quartz is one of the most abundant and durable minerals in Earth's continental crust, which is why quartz pebbles are extremely common in riverbeds and beaches worldwide.

Field identification & locations

Can be identified in the field by its high hardness (scratches glass), lack of cleavage, and smooth rounded shape resulting from stream transport. Found globally in alluvial deposits, river gravels, and beaches.