sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Hardness: 6-7 Mohs; Color: reddish-brown to pink due to iron oxide; Luster: dull to earthy; Texture: granular, medium-grained; Cleavage: none.

Hardness: 6-7 Mohs
Color: reddish-brown to pink due to iron oxide
Luster: dull to earthy

Identified May 1, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: reddish-brown to pink due to iron oxide; Luster: dull to earthy; Texture: granular, medium-grained; Cleavage: none.

Formation & geological history

Formed over millions of years through the accumulation and cementation of sand-sized mineral particles or rock fragments in environments like deserts, river beds, or ocean basins. The red color indicates oxygen-rich depositional environments.

Uses & applications

Widely used as a construction material for buildings, paving, and decorative garden features. It is also used as a reservoir rock for oil and natural gas.

Geological facts

Red sandstone is famous for creating the landscape of the American Southwest, including the Grand Canyon and Zion National Park. It often preserves footprints and ripple marks from ancient environments.

Field identification & locations

Identify by its gritty, sandpaper-to-the-touch texture and its distinct reddish color. Commonly found in large sedimentary basins and outcrops globally. Collectors look for unique banding or fossil inclusions.