sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock)
AI-generated identification · may be incorrectHardness: 6-7 (Mohs scale), Color: tan, buff, or brown, Luster: dull/earthy, Crystal Structure: clastic (sand-sized grains), Cleavage: none, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, buff, or brown, Luster: dull/earthy, Crystal Structure: clastic (sand-sized grains), 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 within desert, river, or coastal environments over millions of years.
Uses & applications
Widely used for construction, decorative stone, road aggregate, and as a reservoir rock for oil, gas, and groundwater.
Geological facts
Sandstone represents about 20-25% of all sedimentary rocks in the Earth's crust. It often preserves cross-bedding and ripple marks from ancient environments.
Field identification & locations
Identify by the sandpaper-like feel and visible grains. Common in sedimentary basins and canyons; collectors look for specimens with unique iron staining or fossil remains.
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