sedimentary
Sandstone (Weathered Cobble)
Clastic Sedimentary Rock (primarily SiO2)
Hardness: 6-7 (on Mohs scale); Color: Gray to Tan; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None/Irregular fracture; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (on Mohs scale)
- Color
- Gray to Tan
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (on Mohs scale); Color: Gray to Tan; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Cleavage: None/Irregular fracture; Specific gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and lithification of mineral particles or rock fragments, typically sand-sized grains. This specific specimen shows signs of water erosion (rounding), likely found in a riverbed or coastal environment.
Uses & applications
Commonly used in construction as an aggregate, for paving, or as building stone. Finely ground sandstone is often used in the glass and ceramic industries.
Geological facts
Sandstone is one of the most common sedimentary rocks on Earth. It often preserves fossils and ripple marks from ancient riverbeds or beaches, providing a direct record of past environments.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. It is extremely common in riverbeds, canyons, and sedimentary basins worldwide.
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