sedimentary

Red Sandstone

Clastic sedimentary rock (often dominated by SiO2 with Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Brick red to reddish-brown; Luster: Dull or earthy; Crystal structure: Granular/Clastic; Cleavage: None; Texture: Gritty/Sand-like

Hardness: 6-7 (Mohs scale)
Color: Brick red to reddish-brown
Luster: Dull or earthy

Identified July 14, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Brick red to reddish-brown; Luster: Dull or earthy; Crystal structure: Granular/Clastic; Cleavage: None; Texture: Gritty/Sand-like

Formation & geological history

Formed from the accumulation and cementation of sand-sized grains, typically in desert or river delta environments. Red color comes from the oxidation of iron minerals (hematite) coating the grains.

Uses & applications

Used widely in construction (flagstone, building cladding), landscaping, and as an architectural decorative stone.

Geological facts

The famous red rocks of Sedona and the Grand Canyon are primarily composed of red sandstone layers that represent ancient environments spanning millions of years.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and distinct layering. Common in the Southwestern United States and Northern England.