sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
Hardness: 6-7 Mohs; Color: Tan, yellow, reddish-brown; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; SG: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan, yellow, reddish-brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, yellow, reddish-brown; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; SG: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments. The yellow-brown color indicates the presence of iron oxide (limonite or goethite) within the cementing matrix.
Uses & applications
Commonly used in construction as a building stone or road base. Also used in glass making and as a source for fracking sand.
Geological facts
Sandstone layers can act as major aquifers for groundwater or reservoirs for oil and natural gas. Some sandstones preserve spectacular fossil footprints.
Field identification & locations
Identify by its gritty texture (like sandpaper) and visible sand grains. Common in sedimentary basins worldwide. Often shows bedding planes.
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