sedimentary
Sandstone
Arenite (SiO2 primarily)
Mohs hardness: 6-7 (if quartz-rich), Color: tan, brown, or buff, Luster: dull to earthy, Texture: clastic/gritty like sandpaper, Structure: absence of visible cleavage, Specific gravity: approx 2.0-2.6
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Physical properties
Mohs hardness: 6-7 (if quartz-rich), Color: tan, brown, or buff, Luster: dull to earthy, Texture: clastic/gritty like sandpaper, Structure: absence of visible cleavage, Specific gravity: approx 2.0-2.6
Formation & geological history
Formed by the accumulation and cementation of sand-sized mineral particles or rock fragments, typically in river beds, beaches, or deserts over millions of years through lithification.
Uses & applications
Used extensively in construction as a building material, for paving, and in the manufacturing of glass and grindstones.
Geological facts
Sandstone represents about 20-25% of all sedimentary rocks on Earth. It is an excellent aquifer for groundwater and can often contain oil and natural gas deposits.
Field identification & locations
Identify in the field by its distinct 'sandpaper' feel and visible grains. Often found in layered outcrops or as water-worn pebbles in stream beds.
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