sedimentary

Red Sandstone

Arenite (with Iron Oxide cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Red, reddish-brown, or orange; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Red, reddish-brown, or orange
Luster: Dull/Earthy

Identified May 4, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Red, reddish-brown, or orange; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The red color is caused by the oxidation of iron minerals (hematite) during diagenesis in arid or semi-arid terrestrial environments.

Uses & applications

Primarily used in construction for paving, building facades, and decorative masonry. Also used for grindstones and sometimes for glassmaking if quartz content is high.

Geological facts

The famous red rocks of Sedona, Arizona, and the 'Old Red Sandstone' of Great Britain are classic examples. It serves as a major reservoir for groundwater and petroleum.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible sand grains. It is commonly found in desert regions, ancient river beds, and along vertical canyon walls.