sedimentary

Tumbled sandstone pebble

Quartz-rich sandstone (primarily SiO₂)

AI-generated identification · may be incorrect

Fine-grained, rounded tan-brown pebble with a dull to slightly earthy luster; likely Mohs hardness 6–7, depending on cement, with no obvious cleavage. The smooth shape indicates natural abrasion or tumbling.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Sandstone formed when quartz-rich sand was compacted and cemented, commonly by silica, calcite, or iron oxides; the specimen was later weathered and rounded by water or mechanical tumbling. Its exact geological age cannot be determined from the image.

Uses & applications

Used as landscaping stone, aggregate, decorative gravel, and craft material; generally has little jewelry value unless unusually colored or patterned.

Geological facts

The tan color commonly reflects iron-oxide staining. Its very fine texture and uniform surface could also represent a tumbled quartz-rich sedimentary pebble rather than intact bedrock.

Field identification & locations

Identify it by visible sand grains, gritty texture, lack of crystals or cleavage, and a possible vinegar reaction if calcite-cemented. Common in riverbeds, beaches, glacial deposits, and commercial rock tumbling mixtures.