sedimentary

Small rounded pebble, likely sandstone

Quartz-rich sandstone (tentative; exact identification requires closer examination)

AI-generated identification · may be incorrect

Tan-brown, dull and granular, with rounded edges; likely composed mainly of quartz grains and cement. Hardness and specific gravity cannot be determined reliably from the image.

Identified October 8, 2026More sedimentary →

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Physical properties

Tan-brown, dull and granular, with rounded edges; likely composed mainly of quartz grains and cement. Hardness and specific gravity cannot be determined reliably from the image.

Formation & geological history

If sandstone, it formed as sand grains compacted and cemented into rock, then weathered and rounded by transport. Its geological age and original setting cannot be inferred from appearance alone.

Uses & applications

A common collecting specimen or decorative pebble; sandstone is also widely used as building and paving stone.

Geological facts

The visible granular texture is consistent with sandstone, but several fine-grained rocks can look similar in this lighting.

Field identification & locations

Look for distinct sand-sized grains and test whether it scratches glass; a fresh broken surface is more diagnostic than a weathered pebble. Sandstone occurs worldwide, especially in sedimentary basins and stream deposits.