sedimentary

Weathered sandstone

Quartz-rich clastic sandstone, likely ferruginous arkose or litharenite

AI-generated identification · may be incorrect

A coarse, porous, rusty orange-brown rock with sand-sized grains cemented by iron oxides and possibly silica or calcite. Quartz is typically Mohs 7; sandstone is generally soft to moderately hard, with a granular texture, dull earthy luster, and no consistent cleavage.

Identified August 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated in a river, beach, dune, or alluvial setting, then compacted and cemented; the red color reflects oxidized iron. Its exact geological age cannot be determined from the photograph.

Uses & applications

Used as building stone, paving, masonry, aggregate, and occasionally decorative stone; this rough specimen has little gem or industrial value.

Geological facts

The specimen appears strongly weathered and iron-stained, with visible cavities and possible small pebble or mineral inclusions. A streak or scratch test can help distinguish it from softer iron-rich soil concretions.

Field identification & locations

Common in sedimentary basins worldwide, especially arid and semi-arid regions. Identify it by visible sand grains, layered or massive sedimentary texture, porosity, and inability to scratch glass; common hand specimens are worth about $1-$10, while attractive labeled examples may sell for $10-$30.