sedimentary
Sandstone
Arenite (composed mainly of SiO2)
AI-generated identification · may be incorrectHardness: 6-7 (Mohs scale); Color: Tan, brown, reddish; Luster: Dull to earthy; Structure: Clastic, granular; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, brown, reddish
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, brown, reddish; Luster: Dull to 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 deserts, riverbeds, or ocean basins.
Uses & applications
Used widely in construction for building stone, pavers, and retaining walls; also used as a source of silica for glass making.
Geological facts
Sandstone makes up approximately 20% to 25% of all sedimentary rocks in the Earth's crust and is a major reservoir for groundwater and petroleum.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grains. Commonly found in canyons and coastal cliffs. Collectors should look for unique layering or cross-bedding.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
Arenite (if sandstone)
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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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