sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Sandstone (SiO2 predominant)
Hardness: 6-7 (individual grains), Color: Tan to reddish-brown, Luster: Dull/Earthy, Structure: Granular/Clastic, Cleavage: None, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (individual grains), Color: Tan to reddish-brown, Luster: Dull/Earthy, Structure: Granular/Clastic, Cleavage: None, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Typically deposited in riverbeds, deserts, or coastal environments over millions of years.
Uses & applications
Used primarily in construction (building stone, flagstone), as an abrasive in tool sharpening, and as a reservoir rock for water, oil, and gas.
Geological facts
Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks on Earth. Many famous landforms, such as the Grand Canyon and Petra in Jordan, are composed of sandstone.
Field identification & locations
Identify by its gritty, sandpaper-like texture and visible grains. Often found in areas with exposed sedimentary layers or river basins. Collectors look for unique banding or patterns.
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