sedimentary
Sandstone
Arenite (SiO2 primarily)
AI-generated identification · may be incorrectHardness: 6-7 Mohs; Color: Grey, tan, or brown; Luster: Dull/Earthy; Structure: Clastic, granular; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Grey, tan, or brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Grey, tan, or brown; Luster: Dull/Earthy; Structure: Clastic, granular; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (sand) over millions of years in environments such as river beds, deserts, or ocean floors.
Uses & applications
Commonly used as a building material, in the manufacturing of glass, for road construction, and as a grit for grinding and sharpening tools.
Geological facts
Sandstone often preserves fossils and ripple marks from ancient environments, acting as a geological time capsule. It covers about 25% of the earth's sedimentary rock surface.
Field identification & locations
Identify by its gritty, sandpaper-like texture and visible layers (bedding). It is found worldwide, especially in arid regions like the American Southwest and coastal cliffs.
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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
fossil
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)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary