sedimentary

Iron-rich sandstone or ferruginous rock

Ferruginous sandstone, chiefly quartz (SiO₂) cemented or stained by iron oxides such as hematite (Fe₂O₃)

AI-generated identification · may be incorrect

Reddish-brown, dull and earthy, with a rough, fine-grained surface; likely hardness around 6–7 if quartz-rich, though cementation affects apparent hardness. The photo does not reveal crystal structure or cleavage; it appears massive and irregularly shaped.

Identified October 4, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed as sand-sized grains were deposited and later cemented, with iron oxides producing the red-brown color. Its age and precise formation environment cannot be determined from the image alone.

Uses & applications

Ferruginous sandstone is used as building or decorative stone and may be collected as a common geological specimen; this piece shows no obvious gem or ornamental quality.

Geological facts

Iron-oxide coatings and cement commonly give sandstone red, brown, or rusty colors.

Field identification & locations

Look for gritty texture, visible sand grains, and reddish iron staining; compare a fresh surface because weathering can obscure texture. Ferruginous sandstone occurs in sedimentary formations worldwide.