sedimentary
Sandstone (likely Arkosic)
Clastic Sedimentary Rock
Hardness: 6-7 (Mohs), Color: Tan to yellowish-brown, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None (fractures around grains)
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Physical properties
Hardness: 6-7 (Mohs), Color: Tan to yellowish-brown, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None (fractures around grains)
Formation & geological history
Formed by the accumulation and cementation of sand-sized grains, typically mineral particles or rock fragments. This process occurs in environments such as river beds, deserts, or beaches over millions of years.
Uses & applications
Used primarily as building stone, decorative masonry, and aggregate. In some cases, it serves as an important reservoir for groundwater or petroleum.
Geological facts
Sandstone makes up about 10-20% of all sedimentary rocks on Earth. Because of its porosity, it is the primary rock type found in many of the world's most scenic canyons and arches.
Field identification & locations
Identify in the field by its gritty, sand-like texture (feels like sandpaper). Look for layering (stratification) and individual visible grains cemented together. Found globally in basins and cliffs.
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