sedimentary
Sandstone
Sandstone (Silicon dioxide, SiO2 based)
Hardness: 6-7 Mohs; Color: Tan, brown, reddish; Luster: Dull/Earthy; Texture: Granular, like sandpaper; Structure: Clastic; Cleavage: None.
- Hardness
- 6-7 Mohs
- Color
- Tan, brown, reddish
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, brown, reddish; Luster: Dull/Earthy; Texture: Granular, like sandpaper; Structure: Clastic; Cleavage: None.
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years in deserts, riverbeds, or ocean floors.
Uses & applications
Widely used as an architectural building stone, for making grindstones, as a reservoir rock for oil and gas, and for landscaping.
Geological facts
Sandstone accounts for roughly 20-25% of all sedimentary rocks on Earth. Familiar landmarks like the Grand Canyon are primarily composed of sandstone layers.
Field identification & locations
Identified by its gritty 'sandpaper' feel and visible layers (bedding). Rubbing two pieces together will usually release sand grains. Found globally in sedimentary basins.
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Brown Sandstone (River Rock)
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Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
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Chert Breccia
Brecciated Chert (Microcrystalline Silica)
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