sedimentary

Rounded sandstone pebble

Quartz-rich sandstone (composition cannot be confirmed from the image)

AI-generated identification · may be incorrect

Brown, dull and fine-grained with a rounded, worn surface. Sandstone is typically Mohs 6–7 because of quartz grains; crystal structure and cleavage are not discernible in the photo.

Identified October 10, 2026More sedimentary →

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Physical properties

Brown, dull and fine-grained with a rounded, worn surface. Sandstone is typically Mohs 6–7 because of quartz grains; crystal structure and cleavage are not discernible in the photo.

Formation & geological history

Likely formed when sand grains were compacted and cemented, then exposed and rounded by water or other abrasion. Its age and original formation environment cannot be determined from appearance alone.

Uses & applications

Common sandstone is used as building and paving stone and as a source of aggregate; this small pebble is mainly a souvenir or natural-history specimen.

Geological facts

Sandstone color varies with its mineral grains and cement, including iron oxides that can create brown or red hues.

Field identification & locations

Look for visible sand-sized grains and a gritty texture; a close-up or fresh surface would help distinguish sandstone from other rocks. Rounded pebbles commonly occur in riverbeds and on beaches.