sedimentary

Rounded sandstone cobble

Quartz-rich sandstone (likely quartz arenite; exact composition cannot be confirmed from the image)

AI-generated identification · may be incorrect

Pale tan, dull and visibly granular, with a rounded, worn surface. Sandstone is typically Mohs 6–7 where quartz-rich; grains are cemented together, and the specimen’s internal texture is not visible.

Identified October 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in a sedimentary basin, then rounded by transport or weathering. Its age cannot be determined visually.

Uses & applications

Sandstone is used as building and paving stone, aggregate, and landscaping material; this cobble is mainly suitable for display or collecting.

Geological facts

The rounded outline and sand-sized texture are consistent with prolonged abrasion, though the image alone cannot establish its precise origin.

Field identification & locations

Look for visible sand grains and a gritty texture; quartz-rich sandstone may scratch glass. Similar cobbles occur in river, beach, and glacial deposits worldwide.