sedimentary
Sandstone
Sandstone (SiO2-dominated clastic rock)
AI-generated identification · may be incorrectHardness: 6-7 on Mohs scale (due to quartz grains); Color: tan, reddish-brown, buff; Luster: dull, earthy; Texture: medium-grained, rough sandpaper feel
- Hardness
- 6-7 on Mohs scale (due to quartz grains)
- Color
- tan, reddish-brown, buff
- Luster
- dull, earthy
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Physical properties
Hardness: 6-7 on Mohs scale (due to quartz grains); Color: tan, reddish-brown, buff; Luster: dull, earthy; Texture: medium-grained, rough sandpaper feel
Formation & geological history
Formed by the compaction and cementation of sand-sized grains of mineral, rock, or organic material over millions of years in environments like beaches, deserts, and river beds.
Uses & applications
Widely used as a construction material, paving stone, decorative landscaping stone, and as a source of silica for glass manufacturing.
Geological facts
Sandstone formations create some of the world's most dramatic landscapes, such as the Red Rocks in Nevada and the Grand Canyon in Arizona.
Field identification & locations
Identified by its distinctly gritty, sand-like texture and grainy appearance under close inspection. Common in sedimentary basins worldwide.
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Other sedimentary specimens
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