sedimentary
Red Sandstone
Arenite (primarily Quartz and Iron Oxide)
Hardness: 6-7 (Mohs); Color: Reddish-brown to orange; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs)
- Color
- Reddish-brown to orange
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Reddish-brown to orange; Luster: Dull/Earthy; Structure: Clastic; 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, typically in desert or river environments. The red color indicates the presence of hematite or other iron oxides during formation.
Uses & applications
Extensively used in construction for flagstone, building masonry, and decorative landscaping. Also used as a sharpening stone and for ornamental carvings.
Geological facts
The vibrant red colors of the Grand Canyon and the 'Red Rocks' of Sedona, Arizona, are primarily composed of various layers of red sandstone.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and distinct layering. Common in arid regions and basins globally, especially in the Southwestern United States.
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