sedimentary
Banded Siltstone Pebble
Siltstone (primarily SiO2, Al2O3, Fe2O3)
Hardness: 6-7 (Mohs scale); Color: Brown, grey, and tan banding; Luster: Dull/Earthy; Structure: Clastic with visible laminations; Cleavage: None/Conchoidal fracture.
- Hardness
- 6-7 (Mohs scale)
- Color
- Brown, grey, and tan banding
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Brown, grey, and tan banding; Luster: Dull/Earthy; Structure: Clastic with visible laminations; Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed through the lithification of silt-sized particles deposited in low-energy environments like river deltas, lakes, or floodplains. The rounding occurs due to water erosion in riverbeds or coastal areas.
Uses & applications
Mainly used as decorative gravel, in landscaping, or as garden accents. Common pebbles have little industrial use compared to bulk siltstone used in fillers.
Geological facts
The distinct horizontal stripes represent different pulses of sedimentation over time, sometimes reflecting seasonal changes in soil and organic content during deposition.
Field identification & locations
Identify by its fine-grained texture (smoother than sandstone but grittier than claystone) and the presence of parallel layers. Commonly found in riverbeds and along beaches near sedimentary basins.
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