sedimentary
Red Sandstone
Arenite (SiO2 with Iron Oxide impurities)
Hardness: 6-7 Mohs; Color: reddish-brown due to hematite; Luster: matte/earthy; Crystal Structure: granular/clastic; Cleavage: none; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- reddish-brown due to hematite
- Luster
- matte/earthy
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Physical properties
Hardness: 6-7 Mohs; Color: reddish-brown due to hematite; Luster: matte/earthy; Crystal Structure: granular/clastic; Cleavage: none; Specific Gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation and lithification of sand-sized mineral grains, primarily quartz and feldspar, in desert or river environments where iron oxides coat the grains.
Uses & applications
Widely used as building stone, pavers, decorative garden stones, and as a source for glass sand or grinding wheels.
Geological facts
Red sandstone is famous for creating the dramatic landscapes of the American Southwest, such as the Grand Canyon and Sedona's red rocks.
Field identification & locations
Identified by its gritty sandpaper feel and visible sand grains. Found globally in basins and ancient desert regions. Collectors look for unique banding or wind-worn shapes.
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