sedimentary

Iron-oxide-stained sandstone (likely ferruginous sandstone)

Quartz-rich sandstone cemented or stained by iron oxides, chiefly hematite (Fe₂O₃) and possibly goethite (FeO(OH))

AI-generated identification · may be incorrect

Appears reddish-brown with a yellow-brown area and a rough, granular surface. Typical sandstone hardness is about 6–7 Mohs from quartz; luster is earthy and grains are not visibly crystalline. Exact composition cannot be confirmed from the photo.

Identified October 13, 2026More sedimentary →

Explore Iron-oxide-stained sandstone (likely ferruginous sandstone) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Sand grains were deposited and lithified, then iron-bearing fluids or weathering produced the red and yellow staining. Its age and original depositional environment cannot be determined from the image.

Uses & applications

Commonly used as building or paving stone and sometimes as a decorative specimen; this small, rough piece has little commercial value.

Geological facts

Hematite commonly creates red coloration, while hydrated iron oxides such as goethite can produce yellow-brown tones.

Field identification & locations

Look for gritty, sand-sized grains and earthy iron-oxide colors; a scratch or acid test alone is not definitive. Ferruginous sandstones occur worldwide, but locality is unknown here.