sedimentary

Rounded sandstone pebble

Quartz-rich sandstone, likely ferruginous sandstone

AI-generated identification · may be incorrect

Fine-grained, tan to ochre, dull earthy luster, rounded and smoothly weathered; chiefly quartz grains cemented by silica, calcite, or iron oxides. Typical hardness is about 6–7 for quartz grains, though the specimen may abrade or scratch unevenly; no visible cleavage or crystals.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from compacted and cemented sand, probably in a river, beach, dune, or shallow-marine setting, then rounded by transport and abrasion. Its exact geological age cannot be determined from the photograph and may range from young sediment to ancient bedrock.

Uses & applications

Used mainly as a teaching, display, or lapidary specimen; sandstone is widely used as building stone, paving, and aggregate. This small, unpatterned pebble generally has minimal commercial value.

Geological facts

The orange-brown color commonly comes from hematite or limonite coatings between quartz grains. Smooth shape indicates prolonged abrasion or natural weathering.

Field identification & locations

Identify it by visible sandy texture, gritty feel, earthy tan color, and lack of interlocking crystals; a hand lens may reveal quartz grains. Common in streambeds, beaches, deserts, and glacial deposits worldwide.