sedimentary
Sandstone Pebble
Arenite (SiO2 based)
Hardness: 6-7 (Mohs); Color: Tan, grey, beige; Luster: Dull or earthy; Crystal structure: Granular/Clastic; Cleavage: None; Rounded by water erosion.
- Hardness
- 6-7 (Mohs)
- Color
- Tan, grey, beige
- Luster
- Dull or earthy
Identified More sedimentary →
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, grey, beige; Luster: Dull or earthy; Crystal structure: Granular/Clastic; Cleavage: None; Rounded by water erosion.
Formation & geological history
Formed from the accumulation and cementation of sand-sized grains, typically quartz and feldspar, in environments like rivers, beaches, or deserts. This pebble has been weathered and rounded by fluvial or coastal action.
Uses & applications
Commonly used as construction aggregate, for landscaping, and occasionally as a source for silica in industrial manufacturing.
Geological facts
Sandstone represents about 20-25% of all sedimentary rocks on Earth. This specific specimen is a 'river rock' or 'cobble' that has had its sharp edges smoothed away by millions of collisions in water.
Field identification & locations
Identified by its gritty sandpaper-like feel and visible layered or granular appearance. Commonly found in riverbeds, glacial tills, and along coastlines.
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Arenite (if sandstone)
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Cone-in-cone structure (Secondary Sedimentary Structure)
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Chert Breccia
Brecciated Chert (Microcrystalline Silica)
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Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
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Shale or Slaty Mudstone
Argillaceous sedimentary rock
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Sandstone
Arenite (primarily SiO2)
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