sedimentary
Sandstone
Arenite (SiO2 primarily)
AI-generated identification · may be incorrectColor: Brown/Tan; Hardness: 6-7 Mohs; Texture: Clastic with sand-sized grains; Luster: Dull; Porous and abrasive feel.
- Hardness
- 6-7 Mohs
- Color
- Brown/Tan
- Luster
- Dull
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Physical properties
Color: Brown/Tan; Hardness: 6-7 Mohs; Texture: Clastic with sand-sized grains; Luster: Dull; Porous and abrasive feel.
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments of sand size, typically in desert, river, or coastal environments.
Uses & applications
Extensively used in construction, paving, as a decorative stone, and as a reservoir rock for groundwater and petroleum.
Geological facts
Sandstone represents about 20% of all sedimentary rocks on Earth. Familiar landmarks like the Grand Canyon are primarily composed of sandstone layers.
Field identification & locations
Identified by its gritty feel and visible sand grains. It is extremely common in riverbeds and arid landscapes.
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Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
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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