sedimentary

Rounded sandstone pebble

Quartz-rich sandstone, likely arkose or subarkose

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7 for quartz grains, beige to tan, dull/earthy luster, granular texture, and no obvious cleavage; the rounded shape indicates water abrasion. Exact composition cannot be confirmed from the photograph alone.

Identified August 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized grains were compacted and cemented, commonly by silica, calcite, or iron oxides; the pebble was later eroded and rounded in a stream, beach, or gravel deposit. Its precise age and provenance are indeterminate.

Uses & applications

Used as aggregate, paving, landscaping stone, and occasionally decorative material; this small ordinary pebble has negligible jewelry value.

Geological facts

The fine speckled surface and uniform tan color are consistent with sandstone, though weathered limestone or a fine-grained volcanic rock could look similar.

Field identification & locations

Look for visible sand grains, weak layering, and a gritty surface; sandstone commonly occurs in sedimentary basins worldwide. A streak, acid test, hardness test, and close examination of grain texture would improve identification.