sedimentary
Sandstone
Arenite (primarily SiO2)
Hardness: 6-7 on Mohs scale; Color: Tan, brown, or grey with dark mineral banding; Luster: Dull/Earthy; Structure: Granular/Clastic; Gritty texture like sandpaper.
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, brown, or grey with dark mineral banding
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, brown, or grey with dark mineral banding; Luster: Dull/Earthy; Structure: Granular/Clastic; Gritty texture like sandpaper.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, typically in desert, river, or ocean environments.
Uses & applications
Widely used as an architectural stone for building, paving, and decorative garden features. Also used as a reservoir rock for oil and natural gas.
Geological facts
The banding seen in this specimen, often called 'Liesegang rings', is caused by the rhythmic precipitation of minerals, such as iron oxides, within the porous stone.
Field identification & locations
Identify in the field by its distinct gritty feel and visible layering or ‘bedding’ planes. Commonly found in canyons, beaches, and sedimentary basins worldwide.
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