sedimentary
Sandstone
Arenite (SiO2 based)
Hardness: 6-7 Mohs; Color: Tan, beige, light grey; Luster: Dull/Earthy; Texture: Gritty, medium-grained sand particles; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan, beige, light grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, beige, light grey; Luster: Dull/Earthy; Texture: Gritty, medium-grained sand particles; Specific Gravity: 2.2-2.8
Formation & geological history
Formed via the accumulation and cementation of sand-sized mineral grains, typically quartz or feldspar, in river beds, deserts, or marine environments over millions of years.
Uses & applications
Extensively used as a building material, paving stone, decorative garden rock, and as an aquifer for water or a reservoir for oil and gas.
Geological facts
Sandstone represents about 20% of the total sedimentary rocks on Earth. The famous red rock formations in Sedona, Arizona and the Grand Canyon are primarily sandstone.
Field identification & locations
Identified by its sandpaper-like feel. It is found globally in sedimentary basins. Look for bedding planes or layers when inspecting larger outcrops.
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