sedimentary
Sandstone
Arenite (Quartz-rich sedimentary rock)
AI-generated identification · may be incorrectHardness: 6-7 (Mohs scale); Color: Reddish-brown/Tan; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Reddish-brown/Tan
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Reddish-brown/Tan; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized grains, primarily quartz or feldspar, over millions of years in deserts, riverbeds, or ocean basins.
Uses & applications
Used extensively as a building material, paving stone, in the manufacturing of glass (if high silica), and as a reservoir rock for oil and gas.
Geological facts
The famous Red Rocks Amphitheatre and many historical monuments are constructed from high-quality sandstone due to its durability and aesthetic appeal.
Field identification & locations
Identify in the field by its characteristic 'sandpaper' feel and visible layers of bedding. Often found in dry canyons and coastal cliffs.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
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Shale
Shale (clastic sedimentary rock)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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