sedimentary
Sandstone
Arenite (SiO2 principal)
Hardness: 6-7 (Mohs), Color: Grey to Tan, Luster: Dull/Earthy, Crystal Structure: Clastic grainy texture, Cleavage: None, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs), Color: Grey to Tan, Luster: Dull/Earthy, Crystal Structure: Clastic grainy texture, Cleavage: None, Specific Gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years in marine or terrestrial environments.
Uses & applications
Used extensively in construction as building stone, road base, and as a source of silica for glass manufacturing.
Geological facts
Sandstone can preserve fossilized footprints or ripple marks from ancient riverbeds. It is also a primary reservoir for underground water (aquifers) and oil.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grains. Commonly found in canyons, beaches, and desert regions worldwide. Use a magnifying glass to see individual sand grains.
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