sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
Hardness: 6-7 Mohs; Color: Tan, buff, or yellow-brown; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan, buff, or yellow-brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, buff, or yellow-brown; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Usually deposited in riverbeds, deserts, or coastal environments over millions of years.
Uses & applications
Commonly used as a building material, in glass manufacturing (if high silica), for paving sand, and as decorative garden stones.
Geological facts
Sandstone is often a reservoir for groundwater and petroleum. It makes up roughly 20-25 percent of all sedimentary rocks on Earth.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in basins and sedimentary outcroppings.
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