sedimentary
Sandstone
Arenite (SiO2 principal)
Hardness: 6-7 Mohs; Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal structure: Granular clastic; Texture: Gritty like sandpaper; Specific gravity: 2.2-2.8.
- Hardness
- 6-7 Mohs
- Color
- Tan, brown, or buff
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal structure: Granular clastic; Texture: Gritty like sandpaper; Specific gravity: 2.2-2.8.
Formation & geological history
Formed via the accumulation and cementation of sand-sized mineral particles or rock fragments, typically in desert, river, or coastal environments. Can range from Paleozoic to Cenozoic in age.
Uses & applications
Extensively used in construction, paving, as a source for glass-making (high silica varieties), and as a reservoir rock for oil and natural gas.
Geological facts
Sandstone is highly porous and serves as a major aquifer for groundwater. It often preserves fossils and ripple marks from ancient shorelines.
Field identification & locations
Identify by its sandy, gritty feel when rubbed; it will not fizz with acid unless carbonate cement is present. Commonly found in canyonlands and exposed plateaus.
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