sedimentary
Sandstone
Arenite (SiO2 based)
AI-generated identification · may be incorrectHardness: 6-7 Mohs; Color: Tan, beige, grey; Luster: Dull/Earthy; Texture: Granular/Sand-like; Porosity: High; Structure: Clastic
- Hardness
- 6-7 Mohs
- Color
- Tan, beige, grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, beige, grey; Luster: Dull/Earthy; Texture: Granular/Sand-like; Porosity: High; Structure: Clastic
Formation & geological history
Formed by the accumulation and cementation of sand-sized mineral grains (usually quartz or feldspar) over millions of years in environments like beaches, deserts, or river beds.
Uses & applications
Extensively used as a building material, paving stone, and decorative gravel. It is also a key reservoir rock for water, oil, and natural gas.
Geological facts
Sandstone represents about 20% of all sedimentary rocks on Earth. It often preserves footprints and ripple marks from ancient environments.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grains. It is extremely common globally. Collectors often look for color banding or fossil inclusions.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary