sedimentary
Sandstone (Pebble)
Arenite (SiO2 based)
AI-generated identification · may be incorrectHardness: 6-7 Mohs; Color: Brown/Tan; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Brown/Tan
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Brown/Tan; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, often in riverbeds or marine environments.
Uses & applications
Commonly used in construction as a building material, for paving, and in the manufacturing of glass and grindstones.
Geological facts
Sandstone is one of the most common sedimentary rocks on Earth and often preserves fossils or ripple marks from ancient environments.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grains. Commonly found in deserts, river basins, and coastal areas.
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Other sedimentary specimens
Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary