sedimentary

Red sandstone (likely iron-stained)

Quartz-rich sandstone, commonly cemented by silica, calcite, or iron oxides

AI-generated identification · may be incorrect

Reddish-brown, rough and granular, with a dull to earthy luster; typically composed mostly of quartz (Mohs 7) and has no distinct cleavage. The specimen’s grain size and hardness cannot be confirmed from the image.

Identified October 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when sand accumulates, is compacted, and cemented; iron oxides produce the red coloration. Sandstones range widely in geological age and form in settings such as rivers, deserts, and beaches.

Uses & applications

Used as building and paving stone, landscaping material, and decorative stone; small pieces are mainly of interest to collectors.

Geological facts

Red coloration commonly results from hematite or other iron-oxide coatings on sand grains.

Field identification & locations

Look for visible sand-sized grains and a gritty texture; a fresh surface may reveal grains more clearly. Red sandstone is widespread, but this image alone cannot establish its exact locality or composition.