sedimentary
Sandstone (Quartzite-rich River Cobble)
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 (Mohs); Color: Tan, beige, or light grey; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs)
- Color
- Tan, beige, or light grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, beige, or light grey; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of mineral particles (sand). This specific specimen shows significant rounding, indicating it was eroded and transported by water (river or beach action) over a long period.
Uses & applications
Commonly used in construction as an aggregate, for landscaping, and historically as building stone or grindstones.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks. Because it is porous, it often serves as a primary reservoir for ground water and petroleum.
Field identification & locations
Identify by its 'sandpaper' feel and visible tiny grains. It is extremely common worldwide in dry environments and along riverbeds. For collectors, it is a basic educational specimen.
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