sedimentary

Rounded sandstone pebble

Quartz-rich sandstone (likely arkosic or ferruginous sandstone)

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7 for quartz grains, with a pinkish-brown to tan color, dull to slightly gritty luster, and visible granular texture. It has no consistent cleavage; iron oxides likely produce the brown-red staining, while weathering and abrasion created the smooth surface.

Identified September 6, 2026More sedimentary →

Explore Rounded sandstone pebble in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed when sand was deposited, compacted, and cemented—probably with silica, carbonate, or iron-oxide cement—then rounded by stream or beach transport. The precise geological age and source cannot be determined from the photograph.

Uses & applications

Commonly used as aggregate, paving stone, landscaping material, and building stone; attractive pieces may be collected as natural river or beach specimens. It has little jewelry value unless unusually patterned or strongly colored.

Geological facts

The rounded shape records prolonged abrasion during transport. Pale veins or patches may represent quartz or carbonate cement, while dark specks can be iron oxides or lithic grains.

Field identification & locations

Identify it by its sand-sized grains, earthy pink-brown coloration, and lack of layering or crystalline faces; a hand lens and dilute acid test can help distinguish carbonate cement. Sandstone pebbles are widespread in rivers, beaches, and glacial deposits worldwide.