sedimentary

Rounded sandstone pebble

Quartz-rich sandstone, likely arkose or subarkose

AI-generated identification · may be incorrect

Fine- to medium-grained, pale tan-pink, dull earthy luster, and rounded by abrasion; mainly quartz with feldspar and minor iron-oxide cement. Typical hardness is about 6–7 for individual grains, but the stone may scratch or crumble depending on cementation; no obvious cleavage or crystals are visible.

Identified September 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in an ancient river, beach, dune, or shallow-marine setting, then naturally rounded by transport. Its exact geological age cannot be determined from the photograph.

Uses & applications

Used as landscape stone, aggregate, building stone, and occasionally as a decorative or craft pebble; this ordinary specimen has little jewelry value.

Geological facts

The pinkish color commonly reflects potassium feldspar or iron oxides, while the smooth shape indicates prolonged water or sediment abrasion. A hand lens would reveal sand-sized grains and cement between them.

Field identification & locations

Common worldwide, especially in sandstone terrains and stream or beach gravels. Test a fresh surface with dilute hydrochloric acid for carbonate cement, inspect grain size with a loupe, and compare scratching against glass; value is typically $1–$10 for a common collected pebble.