sedimentary

Red Sandstone

Ferruginous Sandstone

Hardness: 6-7 (Mohs), Color: Reddish-brown to orange-brown, Luster: Dull/Earthy, Particle size: Medium (0.06 to 2 mm), Texture: Clastic and gritty like sandpaper.

Luster: Dull/Earthy, Particle size: Medium (0

Identified July 17, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs), Color: Reddish-brown to orange-brown, Luster: Dull/Earthy, Particle size: Medium (0.06 to 2 mm), Texture: Clastic and gritty like sandpaper.

Formation & geological history

Formed through the accumulation of sand-sized mineral particles or rock fragments, cemented together by iron oxides (hematite) in arid, terrestrial environments such as deserts or river floodplains.

Uses & applications

Widely used as a construction material for building facades, paving, and monuments; historically significant in architecture (e.g., temples and brownstone houses).

Geological facts

The red color is caused by the oxidation of iron minerals, essentially making the rock 'rusted'. It is often found in 'Red Beds' which indicate oxygen-rich continental depositional environments.

Field identification & locations

Identify in the field by its distinctive gritty feel and layered appearance. Common in the American Southwest (Sedona, Grand Canyon) and the UK (Old Red Sandstone).