sedimentary
Sandstone
Arenite (SiO2 based typically)
Hardness: 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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Arenite (if sandstone)
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Mudstone
Argillite / Siliciclastic sedimentary rock
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Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
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Brown Sandstone (River Rock)
Arenite
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
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Chert Breccia
Brecciated Chert (Microcrystalline Silica)
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