sedimentary
Sandstone
Arenite (SiO2 based typically)
AI-generated identification · may be incorrectHardness: 6-7 Mohs; Color: Brown, tan, reddish; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None
- Hardness
- 6-7 Mohs
- Color
- Brown, tan, reddish
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Brown, tan, reddish; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years in deserts, river beds, or ocean floors.
Uses & applications
Widely used in construction, architectural carvings, and as a reservoir rock in the petroleum industry.
Geological facts
Sandstone represents about 20% of all sedimentary rocks on Earth. The famous red rocks of the Grand Canyon are primarily comprised of various sandstone layers.
Field identification & locations
Identify in the field by its gritty, sandpaper-like feel and visible layering or bedding planes. Often found in arid regions or coastal cliffs.
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Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary