sedimentary
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
Hardness: 3-5 Mohs scale. Color: Olive green to grayish-brown with sub-parallel lighter sedimentary banding. Luster: Dull to smooth satiny matte finish when beach/stream polished. Grain size: Fine-grained clastic sedimentary texture.
- Hardness
- 3-5 Mohs scale
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Physical properties
Hardness: 3-5 Mohs scale. Color: Olive green to grayish-brown with sub-parallel lighter sedimentary banding. Luster: Dull to smooth satiny matte finish when beach/stream polished. Grain size: Fine-grained clastic sedimentary texture.
Formation & geological history
Formed by the compaction and cementation of fine-grained, silty sedimentary layers deposited in calm water environments such as lakes, river deltas, or deep marine basins over millions of years. Naturally rounded and smoothed by water action.
Uses & applications
Primarily collected as a beach pebble, decorative stone for landscaping, or used in lapidary art and stone tumbling.
Geological facts
The distinct parallel bands represent historic seasonal or temporal changes in sediment deposition, known as varves or sedimentary laminations.
Field identification & locations
Identified in the field by its soft, fine-grained texture, smooth surface, and distinct color laminations. Very common on riverbeds and coastal beaches worldwide.
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