sedimentary

Weathered sandstone

Quartz-rich clastic sandstone, likely iron-oxide-stained

AI-generated identification · may be incorrect

Tan to rusty-brown, granular and unevenly cemented, with a dull earthy luster; composed mainly of quartz grains with feldspar, clay, and iron-oxide cement. Typical hardness is about 6–7 for quartz grains, though the rock may crumble along weak cemented zones; no obvious cleavage.

Identified August 8, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, was compacted, and cemented by silica, calcite, or iron oxides in a river, shoreline, dune, or floodplain environment. Its exact geological age cannot be determined from the photograph; surface rusting reflects later weathering and oxidation.

Uses & applications

Commonly used as building stone, paving, aggregate, and decorative rock; attractive varieties are used for landscaping and architectural facing. This weathered specimen has little gem or commercial value.

Geological facts

The reddish-orange coloration generally comes from hematite or limonite coatings on the grains. The rough granular texture and likely bedding-related breakage distinguish it from massive crystalline igneous rocks.

Field identification & locations

Look for visible sand-sized grains, gritty texture, layering, and reddish iron staining; a hand lens and dilute acid test can help detect carbonate cement. Sandstone is widespread in river valleys, deserts, coastal cliffs, and sedimentary basins worldwide.