sedimentary
Sandstone
Arenite (SiO2 predominantly)
Hardness: 6-7 Mohs; Color: Tan, brown, or buff; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8.
- Hardness
- 6-7 Mohs
- Color
- Tan, brown, or buff
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, brown, or buff; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8.
Formation & geological history
Formed via the accumulation and cementation of sand-sized mineral grains (usually quartz) in environments like deserts, riverbeds, or beaches. Geological age ranges from Precambrian to Cenozoic.
Uses & applications
Extensively used in construction, paving, grindstones/sharpening stones, and as an ornamental garden stone. High-purity silica sandstones are used in glass manufacturing.
Geological facts
Sandstone can preserve fossilized footprints and ripple marks from ancient water bodies; it is a major reservoir for groundwater, oil, and natural gas due to its porosity.
Field identification & locations
Identified by its gritty, sandpaper-like feel and visible grains. Commonly found in sedimentary basins and arid regions with exposed bedrock canyons.
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