sedimentary
Sandstone
Arenite (SiO2 primarily)
Hardness: 6-7 (Mohs scale), Color: tan, brown, or reddish, Luster: dull to earthy, Crystal Structure: granular/clastic, Cleavage: none, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, brown, or reddish, Luster: dull to earthy, Crystal Structure: granular/clastic, Cleavage: none, Specific Gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation of sand-sized mineral particles or rock fragments, cemented together by silica, calcium carbonate, or iron oxide over millions of years in environments like deserts, river beds, or beaches.
Uses & applications
Widely used as a construction material for building, paving, and crushing into sand for concrete; also collected for its layered decorative appearance.
Geological facts
Sandstone is one of the most common types of sedimentary rock and can preserve fossils, ripples, and cross-bedding from ancient environments. It often acts as a natural aquifer for groundwater.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in canyon lands, desert outcrops, and mountain ranges.
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Sandstone or Siltstone
Arenite (if sandstone)
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Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
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Chert Breccia
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