sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
Hardness: 6-7 (Mohs scale), Color: tan/buff to light brown, Luster: dull to earthy, Crystal structure: granular clastic texture, Cleavage: none, Specific gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan/buff to light brown, Luster: dull to earthy, Crystal structure: granular clastic texture, 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 in shallow marine, river, or desert environments. This specimen appears to be of the Cenozoic or Mesozoic era based on common surface finds.
Uses & applications
Used widely as building material, in road base, and as a source of silica for glass manufacturing.
Geological facts
Sandstone accounts for about 10-25% of the sedimentary rock on Earth. It is highly porous and often serves as a natural reservoir for groundwater, oil, and gas.
Field identification & locations
Identify by its gritty, sandpaper-like texture and visible sand grains. It is common in riverbeds, canyons, and sedimentary basins. Look for layered bedding planes.
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