sedimentary
Sandstone
Arenite (SiO2 based)
Hardness: 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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Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
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Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
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Chert Breccia
Brecciated Chert (Microcrystalline Silica)
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Shale or Slaty Mudstone
Argillaceous sedimentary rock
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Sandstone
Arenite (primarily SiO2)
sedimentary