sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically brown, tan, or clear in weathered river pebbles, vitreous to dull luster depending on wear, conchoidal fracture, specific gravity of 2.65.

Identified July 30, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, typically brown, tan, or clear in weathered river pebbles, vitreous to dull luster depending on wear, conchoidal fracture, specific gravity of 2.65.

Formation & geological history

Formed through the weathering and erosion of parent igneous or metamorphic rocks, followed by prolonged transport and rounding in fluvial or marine environments.

Uses & applications

Used in landscaping, decorative gravel, aggregate in construction, and general lapidary work.

Geological facts

Quartz is one of the most abundant and durable minerals on Earth, highly resistant to both chemical and mechanical weathering, which allows small pebbles to survive millions of years of transport.

Field identification & locations

Found worldwide in riverbeds, beaches, and ancient sedimentary conglomerates. Easily identified by its high hardness (scratches glass) and lack of cleavage.