sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
Hardness: 6-7 Mohs; Color: reddish-brown; Luster: matte/earthy; Structure: Clastic; Cleavage: none; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- reddish-brown
- Luster
- matte/earthy
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Physical properties
Hardness: 6-7 Mohs; Color: reddish-brown; Luster: matte/earthy; Structure: Clastic; Cleavage: none; Specific Gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation and lithification of sand-sized mineral particles or rock fragments, cemented by iron oxides like hematite, typical of desert or riverbed environments.
Uses & applications
Used extensively in construction (as a building stone), architectural carvings, and landscaping; historically significant in monument construction.
Geological facts
The red color comes from iron oxide (rust) coating the sand grains. Famous formations include the Grand Canyon and the Red Rocks of Sedona.
Field identification & locations
Identify by its gritty sandpaper-like texture and reddish staining that doesn't wash off. Common in arid regions and ancient sedimentary basins.
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