sedimentary

Likely iron-stained sandstone

Quartz-rich sandstone, with iron-oxide cement or staining (composition uncertain from image)

AI-generated identification · may be incorrect

Small, rough, reddish-brown, dull and apparently granular. Sandstone is usually mostly quartz (Mohs 7); grain size and hardness cannot be confirmed from the photo.

Identified October 3, 2026More sedimentary →

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Physical properties

Small, rough, reddish-brown, dull and apparently granular. Sandstone is usually mostly quartz (Mohs 7); grain size and hardness cannot be confirmed from the photo.

Formation & geological history

Forms when sand is compacted and cemented, often in river, shoreline, or desert environments; the iron-rich color develops through oxidation. Its geological age cannot be determined from appearance alone.

Uses & applications

Common sandstone is used as building and paving stone, aggregate, and decorative material; this small fragment has little practical value.

Geological facts

Iron oxides such as hematite or goethite commonly stain sandstone red or brown.

Field identification & locations

Look for visible sand-sized grains and a gritty texture; a fresh broken surface may reveal cement between grains. Similar material occurs widely in sedimentary terrains worldwide.