sedimentary
Red Sandstone
Arenite (Fe2O3 enriched)
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
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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.
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