sedimentary
Sandstone
Arenite (SiO2 principal)
Hardness: 6-7 on Mohs scale; Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Feel: Gritty like sandpaper.
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, brown, or buff
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None; Feel: Gritty like sandpaper.
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments. Typically deposited in deserts, riverbeds, or beaches over millions of years.
Uses & applications
Used extensively in construction for paving, building stone, and as a source of silica for glass manufacturing.
Geological facts
Sandstone can be a significant reservoir for groundwater and petroleum. Some famous rock formations, like those in the Grand Canyon and Antelope Canyon, are primarily sandstone.
Field identification & locations
Identify by its gritty texture (rubbing off sand grains) and visible layering or bedding. Commonly found in coastal areas, deserts, and sedimentary basins.
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