sedimentary

Banded sandstone pebble

Lithified quartz–feldspar sandstone, possibly iron-oxide-banded arenite

AI-generated identification · may be incorrect

Fine- to medium-grained, rounded and naturally polished; brown, gray, and reddish bands with earthy to dull luster. Typically Mohs 6–7 because of quartz; no obvious cleavage, with specific gravity about 2.2–2.7.

Identified September 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from sand deposited in layered beds, later compacted and cemented, with reddish bands produced by iron-oxide staining or changing sediment sources. The exact geological age cannot be determined from the photograph; its rounded shape indicates transport by water or ice.

Uses & applications

Used mainly as a decorative pebble, paperweight, or lapidary/collecting specimen; sandstone is also widely used as building and paving stone. This individual piece has modest commercial value.

Geological facts

The curved parallel bands are sedimentary layering rather than crystal growth. Surface rounding and polish commonly develop in stream channels, beaches, or glacial deposits.

Field identification & locations

Look for gritty texture, visible sand grains, layered color bands, and a lack of crystalline sparkle; a steel nail should generally not scratch quartz-rich areas. Common in river gravels and sandstone outcrops worldwide.