sedimentary
Sandstone (likely Greywacke or Siltstone variety)
Arenite / Siltstone (primarily SiO2)
Hardness: 6-7 Mohs; Color: Grey/light brown with speckled weathering; Luster: Dull/Earthy; Structure: Clastic, fine-grained; Cleavage: None (conchoidal to irregular fracture); Specific Gravity: 2.2–2.8
- Hardness
- 6-7 Mohs
- Color
- Grey/light brown with speckled weathering
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Grey/light brown with speckled weathering; Luster: Dull/Earthy; Structure: Clastic, fine-grained; Cleavage: None (conchoidal to irregular fracture); Specific Gravity: 2.2–2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen likely formed in a marine shelf environment where tectonic activity introduced mixed lithic fragments (Greywacke).
Uses & applications
Used primarily as aggregate in construction, road base, and occasionally as dimension stone for landscaping or building veneers if the bedding is stable.
Geological facts
Sandstone is one of the most common sedimentary rocks in the Earth's crust. It is highly porous and often acts as a natural aquifer or a reservoir for petroleum and natural gas.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible layering or bedding planes. It is commonly found in sedimentary basins, canyons, and mountainous regions worldwide.
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