sedimentary
Sandstone
Arenite (SiO2 principal)
Hardness: 6-7 Mohs; Color: Tan, brownish-grey; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; SG: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan, brownish-grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, brownish-grey; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; SG: 2.2-2.8
Formation & geological history
Formed by the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years in deserts, river beds, or ocean floors.
Uses & applications
Commonly used as a decorative building stone, in paving, and as a source of silica for glass making.
Geological facts
Sandstone represents about 20% of all sedimentary rocks on Earth. It is many times an excellent aquifer, holding large amounts of water in its pores.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grains. Often found in layered outcrops or as weathered cobbles in riverbeds.
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