sedimentary

Weathered iron-rich sandstone or ironstone

Ferruginous sandstone; predominantly quartz (SiO₂) cemented or stained by iron oxides/hydroxides

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7 for quartz-rich areas, earthy yellow-brown to reddish color, dull to weakly earthy luster, and granular texture; the visible fracture suggests poorly developed bedding rather than cleavage. Exact identification is limited by the photograph.

Identified September 11, 2026More sedimentary →

Explore Weathered iron-rich sandstone or ironstone 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

Formed when quartz sand was deposited, compacted, and cemented, with iron minerals producing the ochre coloration through oxidation; age may range from Paleozoic to recent depending on locality. Weathering has rounded and darkened the surface.

Uses & applications

Used locally as building stone, aggregate, and decorative landscaping material; attractive pieces may be collected, but this specimen has little gem value.

Geological facts

Iron-rich sandstone can resemble limonite or weathered jasper, and its color may intensify when wet. A streak or magnetic response can help distinguish ironstone varieties.

Field identification & locations

Common in sedimentary basins worldwide, including the United States, Australia, India, and Europe. Look for visible sand grains, porous texture, earthy yellow-red staining, and an absence of glassy crystal faces; a metal-streak test and acid test are useful but inconclusive alone.