sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 (Mohs scale), Color: Reddish-brown to tan, 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: Reddish-brown to tan, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments. Typically deposited in environments like deserts, river deltas, or beaches. These rocks can range from millions to billions of years old.
Uses & applications
Widely used as a construction material for building, paving, and decorative stonework. It is also a key reservoir rock for oil, gas, and groundwater.
Geological facts
Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks on Earth. Famous sandstone formations include the Grand Canyon and the Red Rocks of Sedona.
Field identification & locations
Identify by its gritty, sand-like texture (feels like sandpaper). It often shows layering or cross-bedding. Look for it in areas with exposed sedimentary outcrop or riverbeds.
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