sedimentary

Rounded, weathered rock pebble (likely sandstone)

Quartz-rich sandstone; exact identification requires examination or testing

AI-generated identification · may be incorrect

Tan-yellow, dull, granular surface with rounded shape; likely mostly quartz grains cemented by silica, iron oxides, or clay. Quartz is Mohs 7; sandstone has no single crystal structure or consistent hardness.

Identified October 10, 2026More sedimentary →

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Physical properties

Formation & geological history

Probably formed as sand deposited and cemented in an ancient sedimentary environment, then rounded by water or abrasion. Its geological age and precise formation setting cannot be determined from the image.

Uses & applications

Primarily a natural collectible or decorative pebble; sandstone is widely used as building and paving stone where suitable.

Geological facts

The visible sand-sized grains and rounded outline suggest a worn sedimentary pebble, but the photograph alone cannot rule out other granular rocks.

Field identification & locations

Look for distinct sand grains and a gritty texture; a fresh broken surface and acid or hardness tests can help distinguish sandstone from similar rocks. Sandstone pebbles occur in riverbeds, beaches, and glacial deposits worldwide.