sedimentary
Sandstone
Arenite (SiO2 variety)
Hardness: 6-7 Mohs; Color: Tan, grey, or brownish; Luster: Dull/Earthy; Texture: Gritty like sandpaper; Specific gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan, grey, or brownish
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, grey, or brownish; Luster: Dull/Earthy; Texture: Gritty like sandpaper; Specific gravity: 2.2-2.8
Formation & geological history
Formed via the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in riverbeds, deserts, or ocean floors over millions of years.
Uses & applications
Used extensively in construction as a building material, flooring, and decorative stone. Sometimes used in glass manufacturing if high in silica.
Geological facts
Sandstone can preserve fossilized footprints and ripple marks from ancient water currents. It is a common reservoir rock for oil and natural gas.
Field identification & locations
Identified by its sandy feel; if you rub it, small grains of sand may come off. Commonly found in canyons, river banks, and sedimentary basins.
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