sedimentary

Iron-rich sandstone (ferruginous sandstone)

Ferruginous quartz sandstone, cemented by iron oxides such as hematite and goethite

AI-generated identification · may be incorrect

Reddish-brown, earthy to dull luster, with a granular texture and no obvious cleavage; typically Mohs 6–7 for quartz grains, though cementation and impurities affect hardness. Exact mineral composition cannot be confirmed from the image alone.

Identified October 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand grains were deposited and later cemented by iron oxides, often in oxidizing environments; its age cannot be determined from appearance alone.

Uses & applications

Used locally as building or paving stone and as a decorative landscape stone; specimens are mainly of modest collecting interest.

Geological facts

Iron-oxide coatings and cement give ferruginous sandstone its distinctive red, ochre, or brown colors.

Field identification & locations

Look for gritty sand-sized grains and rusty coloration; it commonly occurs in sedimentary basins and weathered sandstone outcrops. A definitive identification may require a fresh surface or magnification.