sedimentary
Sandstone (Lithic Arenite)
Clastic Sedimentary Rock (primarily SiO2)
Hardness: 6-7 (Mohs); Color: Greyish-brown with gritty texture; Luster: Dull/Earthy; Structure: Clastic; Composition: Quartz, feldspar, and rock fragments (lithics) cemented by silica or calcite.
- Hardness
- 6-7 (Mohs)
- Color
- Greyish-brown with gritty texture
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Greyish-brown with gritty texture; Luster: Dull/Earthy; Structure: Clastic; Composition: Quartz, feldspar, and rock fragments (lithics) cemented by silica or calcite.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years in environments like riverbeds, deserts, or marine basins.
Uses & applications
Commonly used as a building material, road base, or crushed stone. Can be an important reservoir rock for groundwater and petroleum.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The grains inside often retain clues about the environment they traveled through before settling.
Field identification & locations
Identify in the field by its gritty, sand-paper feel. It will often leave a grainy residue when rubbed. Found globally in canyon walls and exposed sedimentary bedding.
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Sandstone
Arenite (primarily SiO2)
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