sedimentary

Banded sandstone pebble

Lithic or quartz-rich sandstone; exact composition requires testing

AI-generated identification · may be incorrect

Typically 6–7 Mohs, reddish-orange from iron oxides, with dark gray bedding bands and a dull to slightly gritty luster. Composed of cemented sand-sized grains; no consistent cleavage, and generally porous with specific gravity around 2.2–2.6.

Identified August 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, was compacted, and cemented in ancient river, desert, delta, or shallow-marine environments; the bands record changing sediment or mineral input. Its precise geological age cannot be determined from the photograph.

Uses & applications

Used as building and paving stone, aggregate, and decorative material; attractive banded pieces are collected but are generally not gemstone-grade.

Geological facts

The dark layers may contain iron-, manganese-, or clay-rich cement and can reflect periodic changes in depositional conditions. The rounded shape indicates transport or abrasion, while the flat cut face appears human-processed.

Field identification & locations

Identify it by visible gritty grains, layered sedimentary texture, reddish iron staining, and lack of interlocking crystals; a hand lens and acid test can help distinguish it from volcanic rock. Common in sedimentary basins worldwide.