sedimentary
Sandstone
Arenite (SiO2 based)
Hardness: 6-7 (Mohs scale), Color: Tan/Brown/Yellow, Luster: Dull/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/Yellow, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None, Specific Gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation and cementation of mineral particles or rock fragments (sand) over millions of years. This specimen likely formed in a riverbed, desert, or marine environment.
Uses & applications
Used primarily as a construction material (building stone, pavers), in glass making (if high silica), and as a reservoir rock for oil and gas.
Geological facts
Sandstone makes up about 10-25% of the Earth's sedimentary rocks. Famous landmarks like the Grand Canyon and the red rocks of Sedona are primarily sandstone formations.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible grains. Often found in layered beds or outcrops near ancient waterways.
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Sandstone
Arenite (primarily SiO2)
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