sedimentary
Sandstone
Arenite (predominantly SiO2)
Hardness: 6-7 Mohs; Color: Tan, brown, or reddish-grey; Luster: Dull/Earthy; Texture: Gritty, granular feel like sandpaper; Composition: Quartz and feldspar grains.
- Hardness
- 6-7 Mohs
- Color
- Tan, brown, or reddish-grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, brown, or reddish-grey; Luster: Dull/Earthy; Texture: Gritty, granular feel like sandpaper; Composition: Quartz and feldspar grains.
Formation & geological history
Formed by the accumulation and lithification of sand-sized mineral particles or rock fragments in environments like deserts, river deltas, or beaches over millions of years.
Uses & applications
Commonly used in construction as a building material, road base, and as a reservoir rock for petroleum and natural gas.
Geological facts
Sandstone can vary significantly in color based on impurities; iron oxides produce reddish or brownish hues. It is often used to map ancient environmental conditions based on bedding patterns.
Field identification & locations
Identified by its gritty feel and visible rounded sand grains. It is extremely common worldwide in sedimentary basins and exposed cliff faces.
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