sedimentary

Rounded sandstone pebble

Quartz-rich sandstone (clastic sedimentary rock)

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7, tan to yellow-brown, dull to slightly silky luster, and fine granular texture; composed of cemented sand grains with no visible cleavage. The rounded shape and smooth surface indicate prolonged water or abrasion wear.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized grains—mostly quartz with feldspar and clay minerals—were compacted and cemented, commonly by silica, calcite, or iron oxides. Its exact geological age cannot be determined from the image; later transport rounded it into a pebble.

Uses & applications

Used mainly as a decorative, landscaping, craft, or educational specimen; sandstone is also widely used as building stone and aggregate. This individual pebble has minimal commercial value.

Geological facts

The tan color commonly reflects iron-oxide staining, while the fine surface texture reflects weathered or very fine sand grains. A streak or acid test can help distinguish sandstone from limestone.

Field identification & locations

Common in riverbeds, beaches, deserts, and sedimentary formations worldwide; inspect a fresh break for visible sand grains and test for weak acid reaction. Estimated value: $1–$10 as a common pebble, or up to about $20 if unusually attractive or from a documented locality.