sedimentary

Ferruginous Sandstone (with Laterite)

Ferruginous Arenite (FeO(OH)·nH2O)

AI-generated identification · may be incorrect

Hardness: 6-7 (on Mohs scale for quartz grains); Color: Reddish-brown, tan, and grey; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.5-3.0

Hardness: 6-7 (on Mohs scale for quartz grains)
Color: Reddish-brown, tan, and grey
Luster: Dull/Earthy

Identified June 20, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (on Mohs scale for quartz grains); Color: Reddish-brown, tan, and grey; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.5-3.0

Formation & geological history

Formed through the accumulation of sand grains cemented together by iron oxides (limonite or hematite) in oxidizing environments. Often found in tropical regions where intense weathering (laterization) occurs.

Uses & applications

Used primarily in local construction as road base, decorative landscaping stone, and occasionally as a low-grade iron ore source in historical contexts.

Geological facts

This material is often an indicator of fluctuating water tables. Laterite soils and rocks cover about 33% of the world's land area, predominantly in the tropics.

Field identification & locations

Identified by its gritty texture and characteristic rust-red or dark brown staining. Look for it in areas with highly weathered soil. It will not react with HCl unless it contains carbonate cement.