sedimentary

Rounded sandstone pebble

Quartz-rich sandstone, likely arkosic or ferruginous sandstone

AI-generated identification · may be incorrect

Tan, fine- to medium-grained, dull earthy luster, rounded and naturally weathered. Dominated by quartz with possible feldspar and iron-oxide cement; typical hardness is about 6–7 for individual grains, with no obvious cleavage.

Identified August 20, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand was deposited, compacted, and cemented in a sedimentary basin, then rounded by stream or wave transport. Its precise geological age and formation locality cannot be determined from the photograph.

Uses & applications

Used mainly as a landscaping, decorative, or educational specimen; sandstone also serves as a building and paving stone. This small pebble has little commercial value.

Geological facts

The pale tan color commonly reflects quartz-rich sand and minor iron staining. Surface rounding indicates abrasion during transport, although it may also be a deliberately tumbled fragment.

Field identification & locations

Look for visible sand grains, granular texture, and easy scratching of cement or glass only if the specimen is sufficiently hard; a steel nail may scratch weak cement. Common worldwide in riverbeds, beaches, and weathered sandstone outcrops.