sedimentary

Iron-rich sandstone or weathered laterite

Ferruginous sandstone; chiefly quartz (SiO₂) cemented by iron oxides/hydroxides

AI-generated identification · may be incorrect

Mohs hardness about 5–7 for quartz grains, with softer earthy iron-rich areas; reddish-brown, rough, dull to earthy luster, granular texture, and no obvious cleavage. The irregular, nodular surface suggests strong weathering or ironstone cementation.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when quartz-rich sand was lithified and later stained or cemented by hematite and limonite during oxidation near the surface. Such material commonly forms in terrestrial sedimentary or lateritic weathering environments, generally over millions of years.

Uses & applications

Used locally as building or paving stone and as a minor iron ore; attractive pieces may be collected as geological specimens. It is generally unsuitable for jewelry unless cut and polished.

Geological facts

Iron oxides produce the orange, red, and brown coloration; a reddish streak or yellow-brown earthy residue may indicate hematite or limonite. The photograph alone cannot distinguish ferruginous sandstone confidently from weathered ironstone or altered volcanic rock.

Field identification & locations

Common in arid, tropical, and deeply weathered regions worldwide, including Australia, India, Africa, and the western United States. Check for visible sand grains, acid reaction, streak color, and density; laboratory testing is needed for a definitive identification.