sedimentary
Sandstone
Arenite (SiO2 based)
Hardness: 6-7 (Mohs scale), Color: tan/brown/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/reddish, Luster: dull to earthy, Crystal structure: granular clastic, Cleavage: none, Specific gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation and lithification of sand-sized mineral particles or rock fragments, typically quartz or feldspar, over millions of years in deserts, riverbeds, or ocean floors.
Uses & applications
Extensively used in construction, road building, home decor, and as a reservoir rock for oil and natural gas.
Geological facts
Sandstone can behave similarly to a sponge due to its porosity, allowing it to hold large amounts of water or oil. It is a major component of iconic landforms like the Grand Canyon.
Field identification & locations
Identify in the field by its gritty, sandpaper-like feel and visible layers (bedding planes). Commonly found in arid regions and coastal bluffs.
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Sandstone or Siltstone
Arenite (if sandstone)
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Septarian Concretion containing Brachiopods/Crinoids
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Shale
Shale (clastic sedimentary rock)
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Brown Sandstone (River Rock)
Arenite
sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
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Shale
Argillaceous sedimentary rock
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