sedimentary
Sandstone
Arenite (SiO2 based)
Hardness: 6-7 (Mohs scale); Color: Tan, brown, yellow, and grey; Luster: Dull/Earthy; Texture: Granular, sandpaper-like feel; Cleavage: None.
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, brown, yellow, and grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, brown, yellow, and grey; Luster: Dull/Earthy; Texture: Granular, sandpaper-like feel; Cleavage: None.
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) the size of sand. Created in environments such as deserts, riverbeds, and ocean floors over millions of years.
Uses & applications
Extensively used in construction for flagstone, paving, and building facades. Also used as an aquifer for groundwater and as a reservoir for oil and gas.
Geological facts
Sandstone can preserve fossilized footprints and ripple marks from prehistoric water currents. It makes up roughly 20-25% of all sedimentary rocks on Earth.
Field identification & locations
Identify by its gritty texture and visible sand grains. It often appears in distinct layered beds. Look for it in canyons, road cuts, and coastal cliffs.
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Arenite (if sandstone)
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Cone-in-cone structure (Secondary Sedimentary Structure)
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Brecciated Chert (Microcrystalline Silica)
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Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
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Shale or Slaty Mudstone
Argillaceous sedimentary rock
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Sandstone
Arenite (primarily SiO2)
sedimentary