sedimentary
Banded Sandstone Peabble
Arenite with iron oxide banding
Hardness: 6-7 on Mohs scale; Color: Tan, brown, and grey with darker concentric bands; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Texture: Fine to medium grained and abrasive.
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, brown, and grey with darker concentric bands
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, brown, and grey with darker concentric bands; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Texture: Fine to medium grained and abrasive.
Formation & geological history
Formed through the accumulation and litification of sand-sized mineral particles or rock fragments. The distinct banding (Liesegang rings) is caused by the rhythmic precipitation of iron oxides within the porous rock by groundwater.
Uses & applications
Commonly used as decorative garden stones, in landscaping, or as minor collectibles. High-quality sandstone is used in construction and abrasive manufacturing.
Geological facts
The circular or wavy patterns are often mistaken for fossils, but they are chemical features called Liesegang rings. This specimen has been rounded and smoothed by water transport, likely in a river or coastal environment.
Field identification & locations
Identify in the field by its sandy texture and visible layering or concentric color bands. Found globally in ancient riverbeds, deserts, and beaches. Collectors should look for unique, well-defined banding patterns.
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