sedimentary
Banded Sandstone (Liesegang Rings)
Sedimentary sandstone with Iron oxide precipitates
Hardness: 6-7 (Mohs); Color: Tan, reddish-brown, and cream banding; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None
- Hardness
- 6-7 (Mohs)
- Color
- Tan, reddish-brown, and cream banding
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, reddish-brown, and cream banding; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None
Formation & geological history
Formed from the lithification of sand grains. The distinctive bands (Liesegang rings) are secondary features caused by the rhythmic precipitation of iron oxides from groundwater moving through porous rock over geological time.
Uses & applications
Commonly used as building stone, decorative landscaping, and as a collector's specimen for hobbyists due to its interesting patterns.
Geological facts
The rhythmic bands are named after chemist Raphael E. Liesegang. The distinct patterns can often mimic topography or landscapes, leading many to call them 'picture stones'.
Field identification & locations
Identify by looking for distinct, non-horizontal color bands that often curve or ring. Found in arid regions or areas with high iron content in groundwater. Very common in the Southwestern United States.
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