sedimentary
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
Hardness: 6-7 on Mohs scale; Color: Reddish-brown due to iron oxide; Luster: Dull/Earthy; Crystal structure: Clastic (grain-based); Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 on Mohs scale
- Color
- Reddish-brown due to iron oxide
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Reddish-brown due to iron oxide; Luster: Dull/Earthy; Crystal structure: Clastic (grain-based); Cleavage: None; Specific gravity: 2.2-2.8
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, oxidizing environment (terrestrial setting) where iron minerals rusted.
Uses & applications
Commonly used as a building material, decorative stone in landscaping, and as a source for glass manufacture if high in quartz purity.
Geological facts
Famous formations include the Red Rocks of Colorado and the sandstone buttes of Monument Valley. It often preserves ripple marks and cross-bedding from ancient dunes or riverbeds.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible layering. It is ubiquitous in the American Southwest and various sedimentary basins globally.
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