sedimentary
Red Sandstone
Clastic sedimentary rock (often dominated by SiO2 with Fe2O3)
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
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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.
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