sedimentary

Weathered iron-rich sandstone or laterite pebble

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

AI-generated identification · may be incorrect

Hardness about 5–7 (variable); ochre-brown, dull to earthy luster, fine-grained and porous with rounded weathering surfaces. No visible crystal cleavage; apparent pits may reflect weathering or small cavities.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from sand cemented by silica and iron minerals, or from intensely weathered iron-rich soil (laterite), then rounded by transport. Its precise geological age cannot be determined from the photograph.

Uses & applications

Primarily a teaching or collecting specimen; ferruginous sandstone can be used locally as building or decorative stone, while laterite is sometimes used in construction.

Geological facts

The yellow-brown color commonly comes from goethite and limonite, hydrated iron oxides that coat or cement grains. A streak, acid, and hardness test would help distinguish sandstone from other iron-rich rocks.

Field identification & locations

Common in tropical weathering zones and sedimentary terrains worldwide. Look for gritty sand grains, iron staining, and a reddish-yellow streak; it may weakly attract a magnet only if magnetite is present.