sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Color: Reddish-brown to maroon due to iron oxide; Hardness: 6-7 Mohs (quartz-based); Luster: Dull/Earthy; Structure: Clastic, fine-grained; Cleavage: None.

Hardness: 6-7 Mohs (quartz-based)
Color: Reddish-brown to maroon due to iron oxide
Luster: Dull/Earthy

Identified June 8, 2026More sedimentary →

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Physical properties

Color: Reddish-brown to maroon due to iron oxide; Hardness: 6-7 Mohs (quartz-based); Luster: Dull/Earthy; Structure: Clastic, fine-grained; Cleavage: None.

Formation & geological history

Formed through the accumulation and cementation of sand-sized minerals (mostly quartz and feldspar) in arid or river environments. The red color indicates formation in an oxygen-rich environment where iron minerals oxidized.

Uses & applications

Widely used as building stone, pavers, decorative landscaping, and as a source for glass-making sand if pure.

Geological facts

Red sandstone is responsible for many of the world's most dramatic landscapes, such as the Grand Canyon and the Red Rocks of Sedona. It often preserves footprints and ripple marks from ancient environments.

Field identification & locations

Identify by its gritty, sandpaper-like texture and its dark red or chocolate brown color. It creates a red streak when scratched on a harder surface. Found globally in ancient sedimentary basins.