sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 with Iron Oxide)
Hardness: 6.5-7 (Mohs); Color: Reddish-brown, dull to earthy luster; Texture: Fine to medium grained; Cleavage: None; Composition: Quartz grains cemented by iron oxides.
- Hardness
- 6
- Color
- Reddish-brown, dull to earthy luster
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Reddish-brown, dull to earthy luster; Texture: Fine to medium grained; Cleavage: None; Composition: Quartz grains cemented by iron oxides.
Formation & geological history
Formed through the accumulation and litification of sand-sized grains in arid or riverine environments. The red color is due to the oxidation of iron minerals (hematite coating) during burial.
Uses & applications
Commonly used as building stone, pavers, decorative landscaping, and occasionally as a source of silica and iron oxides in industrial manufacturing.
Geological facts
The famous red rocks of Sedona, Arizona, and the 'Old Red Sandstone' of Great Britain are classic examples of this geological formation.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and its ability to leave a faint reddish streak or dust. Widely found in plateau regions and dry mountain basins.
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