sedimentary

Reddish sandstone pebble

Quartz-rich sandstone, likely ferruginous arkose or litharenite

AI-generated identification · may be incorrect

Fine- to medium-grained, reddish-brown, matte and porous with faint layering; quartz with feldspar/lithic grains cemented by iron oxides and silica or carbonate. Hardness is roughly 6–7 for grains but lower overall; no obvious cleavage, typically specific gravity 2.2–2.7.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in a terrestrial or shallow-marine environment; the red color reflects oxidized iron. Its exact geological age cannot be determined from the photograph and may range from ancient to recent sedimentary deposits.

Uses & applications

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

Geological facts

Iron-oxide coatings commonly produce red, orange, or brown sandstone. Rounded edges indicate transport by water, wind, or glacial action after lithification.

Field identification & locations

Identify it by visible sand-sized grains, porous texture, earthy red color, and lack of crystal faces; a glassy scratch, acid, and grain examination can distinguish it from iron-rich volcanic rock or brick. Common worldwide, especially in riverbeds and desert formations.