sedimentary

Rounded sandstone pebble

Quartz-rich sandstone (primarily quartz, with feldspar and iron-oxide cement)

AI-generated identification · may be incorrect

Tan, fine-grained, dull to slightly earthy luster, and smoothly water-rounded; likely Mohs hardness 6–7 for individual grains but the cement may be softer. Porous, non-crystalline overall, with no obvious cleavage or visible fossils.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand was deposited, compacted, and cemented in an ancient river, beach, dune, or shallow-marine environment; its exact geological age cannot be determined from the image. Later erosion shaped it into a pebble.

Uses & applications

Common sandstone is used for building stone, paving, landscaping, and aggregate; this small rounded piece is mainly suitable for collecting or décor. It has little gemstone value.

Geological facts

The smooth, teardrop-like form indicates prolonged abrasion during transport, most likely by water. The uniform tan color commonly results from iron-oxide staining or cement.

Field identification & locations

Identify it by its gritty texture, sand-sized grains, earthy tan color, and possible porosity; a hand lens or scratch test can help distinguish it from limestone or artificial material. Sandstone pebbles occur widely in river gravels, beaches, and glacial deposits.