sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock)
Hardness: 6-7 Mohs; Color: Tan, brown, or gray; Luster: Dull/Earthy; Crystal structure: Granular clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan, brown, or gray
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, brown, or gray; Luster: Dull/Earthy; Crystal structure: Granular clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation and cementation of mineral particles or rock fragments (clasts) the size of sand. Common in river deltas, beaches, and desert dunes. Ages range from Precambrian to Holocene.
Uses & applications
Used extensively in construction as building stone, pavers, and as a source of silica for glass manufacturing.
Geological facts
Sandstone can capture and store water or oil in its pore spaces, making it a critical aquifer and petroleum reservoir rock.
Field identification & locations
Identified by its 'sandpaper' texture and visible small grains. Often found in layered beds or as rounded water-worn cobbles in riverbeds.
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