sedimentary

Rounded sandstone pebble

Clastic sandstone, likely quartz–feldspar-rich (exact identification requires testing)

AI-generated identification · may be incorrect

Tan to brown, dull earthy luster, visibly granular and possibly porous; grains are likely quartz with feldspar and clay/cement. Typical hardness is about 6–7 for individual quartz grains but the rock may scratch or crumble depending on cement; no obvious cleavage.

Identified August 22, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in a sedimentary basin, commonly from river, beach, or desert deposits. Its exact age cannot be determined visually; rounding indicates transport by water or abrasion.

Uses & applications

Used as building and paving stone, aggregate, and occasionally decorative material; this small specimen has mainly educational or collecting value.

Geological facts

The rounded shape and granular texture distinguish it from many crystalline igneous rocks. A hand lens can reveal sand-sized grains and cement between them.

Field identification & locations

Common worldwide, especially in river gravels, beaches, deserts, and sedimentary formations. Confirm with a glass-scratch test, dilute acid test for carbonate cement, and a streak or magnification check; the image alone cannot exclude weathered granite or another granular rock.