sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
Hardness: 6-7 (Mohs); Color: Reddish-brown to purple; Luster: Dull/Earthy; Crystal structure: Clastic (sand-sized grains); Specific gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs)
- Color
- Reddish-brown to purple
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Reddish-brown to purple; Luster: Dull/Earthy; Crystal structure: Clastic (sand-sized grains); Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments, typically in desert or river bed environments. The red color suggests deposition in an oxygen-rich environment where iron minerals oxidized into hematite.
Uses & applications
Used primarily as decorative landscape stone, construction material, and occasionally in rough stone jewelry or carvings.
Geological facts
The famous red rocks of Sedona, Arizona, and the Grand Canyon are composed of various layers of red sandstone. It is often a great reservoir rock for petroleum and water.
Field identification & locations
Identified by its gritty feel like sandpaper and its distinct layered or blocky weathering patterns. Found commonly in arid regions or ancient basin deposits.
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