sedimentary
Sandstone (Red)
Arenite (Fe2O3 heavy)
Hardness: 6-7 (Mohs); Color: Red, orange, tan; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs)
- Color
- Red, orange, tan
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Red, orange, tan; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Forms from the accumulation of sand-sized mineral grains or rock fragments, cemented together by pressure and silica or iron oxide. Typical of desert dunes, riverbeds, or beach environments.
Uses & applications
Used widely in construction for building stone, paving, and decorative architectural features. Also used as a material for glass making and metal casting molds.
Geological facts
The red color is caused by the presence of iron oxide (hematite). Famous outcrops include the Grand Canyon and the red rocks of Sedona, Arizona.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible bedding layers. Commonly found in sedimentary basins and arid regions globally.
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