sedimentary

Weathered sandstone (probable)

Quartz-rich sandstone, largely composed of cemented quartz grains (SiO₂)

AI-generated identification · may be incorrect

Light tan to reddish-brown, dull earthy luster, visibly granular and porous with possible bedding or fracture planes. Typical hardness is about 6–7 for quartz grains, but the rock can crumble along weak cemented zones; no obvious cleavage.

Identified August 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in a river, desert, beach, or shallow-marine environment; likely a relatively young sedimentary outcrop, though age cannot be determined from the photograph.

Uses & applications

Used as building stone, paving, wall material, aggregate, and occasionally as a decorative stone; porous varieties are generally unsuitable for high-polish jewelry.

Geological facts

Iron-oxide staining commonly produces the red-brown color. The specimen’s irregular weathering and granular texture are consistent with sandstone, but shale, altered volcanic rock, or weathered granite remain possible without a fresh surface or tests.

Field identification & locations

Look for rounded quartz grains, layered bedding, and gritty texture; a streak or fresh break should not be strongly metallic. Common worldwide, especially in sedimentary basins. Estimated value: $5–$30 for an ordinary loose specimen; larger attractive hand specimens may bring $30–$100.