sedimentary

Weathered iron-stained sandstone

Quartz-rich sandstone, likely ferruginous (iron-oxide cemented)

AI-generated identification · may be incorrect

Muted gray, tan, and reddish-brown surface with rusty iron-oxide staining and visible weathering; likely dominated by quartz grains. Sandstone typically has Mohs hardness around 6–7 for quartz grains, but cement strength varies; grain size and luster are difficult to judge from the image.

Identified October 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed as sand was deposited, buried, and cemented, with iron oxides producing the reddish coloration. Its age and exact depositional environment cannot be determined from the photograph.

Uses & applications

Sandstone is used as building and paving stone, aggregate, and sometimes decorative stone; this weathered specimen appears primarily of geological or collecting interest.

Geological facts

Iron oxides such as hematite and goethite commonly create red, brown, or yellow staining in sedimentary rocks.

Field identification & locations

Look for sand-sized grains and a gritty texture; a hand lens can help distinguish sandstone from finer-grained rocks. The photo does not establish its precise location or formation.