sedimentary
Sandstone
Arenite (SiO2 dominant)
Hardness: 6-7 (Mohs scale), Color: Tan to light brown with darker speckles, Luster: Dull/Earthy, Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Tan to light brown with darker speckles, Luster: Dull/Earthy, Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation and lithification of sand-sized mineral grains or rock fragments, typically in river, ocean, or desert environments. This specimen appears to be a clastic sedimentary rock.
Uses & applications
Used extensively in construction as a building stone, for making grindstones, and as a reservoir rock for oil and gas.
Geological facts
Sandstone accounts for approximately 20 to 25 percent of all sedimentary rocks on Earth. It often preserves fossils and ripple marks from ancient environments.
Field identification & locations
Identify in the field by its sandy, gritty texture which feels like sandpaper. It is commonly found in sedimentary basins and coastal areas.
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