sedimentary

Rounded sandstone pebble

Quartz-rich sandstone, likely subarkose or lithic sandstone

AI-generated identification · may be incorrect

Fine-grained, tan to ochre, dull to slightly gritty luster, with rounded sedimentary grains and possible iron-oxide staining. Typical hardness is about 6–7 for individual quartz grains, though the cemented rock can scratch glass variably; no obvious cleavage or crystals are visible.

Identified September 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized grains—mainly quartz, with feldspar or rock fragments—were deposited, compacted, and cemented, commonly in rivers, beaches, or deserts. The rounded shape and smooth surface reflect prolonged water transport and abrasion; its precise geological age cannot be determined from the image.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and architectural material; this small pebble has mainly educational or decorative value.

Geological facts

Iron oxides commonly produce the yellow-brown coloration. The surface appears naturally water-worn rather than freshly broken.

Field identification & locations

Look for visible sand grains, gritty texture, layered or porous structure, and reaction-free behavior with dilute hydrochloric acid. Common in streambeds, beaches, and sedimentary terrains worldwide.