sedimentary
Sandstone
Arenite (primarily Quartz-rich)
Hardness: 6-7 (Mohs scale), Color: tan or light brown, Luster: dull/earthy, Texture: clastic (sand-sized grains), Porosity: moderate to high, Specific gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan or light brown, Luster: dull/earthy, Texture: clastic (sand-sized grains), Porosity: moderate to high, Specific gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and lithification of sand-sized mineral particles or rock fragments, typically deposited in deserts, riverbeds, or beaches. Likely from the Phanerozoic eon.
Uses & applications
Widely used as a construction material, for flagstone in landscaping, as a reservoir rock for oil and gas, and for sharpening tools in its raw form.
Geological facts
Sandstone accounts for roughly 20-25% of all sedimentary rocks on Earth. Famous landmarks like the Treasury at Petra and the Grand Canyon are primarily composed of various sandstone layers.
Field identification & locations
Identify by its 'sandpaper' feel and visible grains. It is extremely common worldwide in outcrop regions and riverbeds. Look for bedding layers and fossils which are often preserved within it.
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Sandstone
Arenite (primarily SiO2)
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