sedimentary

Red Sandstone

Arenite (Fe2O3 enriched)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: Reddish-brown to pink due to iron oxide; Luster: Dull/Earthy; Texture: Granular, sandpaper-like feel; Cleavage: None

Hardness: 6-7 Mohs
Color: Reddish-brown to pink due to iron oxide
Luster: Dull/Earthy

Identified July 4, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Reddish-brown to pink due to iron oxide; Luster: Dull/Earthy; Texture: Granular, sandpaper-like feel; Cleavage: None

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The red color indicates formation in an arid, oxygen-rich environment (terrestrial) where iron minerals oxidized.

Uses & applications

Commonly used as a building material, decorative stone, for paving, and as an aquifer for groundwater and petroleum.

Geological facts

The vibrant red colors of the US Southwest (like the Grand Canyon and Sedona) are primarily made of variations of red sandstone. It records ancient desert dunes and river beds.

Field identification & locations

Identify by its gritty texture and visible sand grains. It will not fizz with acid unless it has a calcitic cement. Found globally in basins and continental shelf areas.