sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
Hardness: 6-7 Mohs; Color: Grey to brownish-grey; Luster: Dull, earthy; Crystal structure: Clastic (grains); Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Grey to brownish-grey
- Luster
- Dull, earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Grey to brownish-grey; Luster: Dull, earthy; Crystal structure: Clastic (grains); Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation and lithification of sand-sized mineral particles or rock fragments, typically cemented by silica or calcium carbonate in river, lake, or ocean beds.
Uses & applications
Commonly used as a building material, in paving, as a decorative stone, and as a reservoir rock for groundwater and petroleum.
Geological facts
Sandstone is highly porous and can hold large quantities of water or oil. It makes up about 20% of all sedimentary rocks on Earth's crust.
Field identification & locations
Identified by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in deserts, river basins, and coastal areas.
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