sedimentary

Rounded sandstone pebble

Clastic sandstone, chiefly quartz and feldspar grains cemented by iron oxides and silica

AI-generated identification · may be incorrect

Fine-grained, tan to rusty brown, dull to slightly earthy luster, with rounded edges from abrasion; typical hardness is about 6–7 for quartz-rich grains, but the rock may crumble more easily. No visible cleavage; granular clastic texture and moderate density (~2.2–2.7 g/cm³).

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Lithified sand deposited in a beach, river, dune, or shallow-marine setting, then compacted and cemented; its exact geological age cannot be determined from the photograph. The rounded shape indicates transport by water or prolonged surface abrasion.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and decorative material; an ordinary pebble has negligible commercial value but may be useful as a teaching or landscaping specimen.

Geological facts

Iron-oxide staining produces the orange-brown color. The smooth, flattened form is typical of a transported cobble or naturally weathered pebble rather than a crystal or ore.

Field identification & locations

Look for visible sand grains, gritty texture, and possible layering; a streak, acid test, and hardness test can help distinguish it from mudstone or iron-rich volcanic rock. Sandstone pebbles occur widely in streambeds, beaches, and glacial deposits.