sedimentary
Sandstone (Quartzose Sandstone)
Clastic Terrigenous Sedimentary Rock (primarily SiO2)
Hardness: 6-7 on Mohs scale; Color: Tan, beige, brown, or grayish; Luster: Dull or earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2 to 2.8
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, beige, brown, or grayish
- Luster
- Dull or earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, beige, brown, or grayish; Luster: Dull or earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2 to 2.8
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen appears to be a river-worn or glacial cobble, rounded by the abrasive action of water or ice over thousands of years.
Uses & applications
Commonly used in construction (as a building stone or road aggregate), landscaping, and as a reservoir rock for petroleum and water in geological basins.
Geological facts
Sandstone accounts for roughly 20-25% of all sedimentary rocks on Earth. The Great Sphinx of Giza is carved from a natural outcrop of limestone and sandstone.
Field identification & locations
Identify in the field by its 'sandpaper' texture and visible grains. Often found in riverbeds, beaches, and desert environments. It will not fizz with acid unless it has a calcitic cement.
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