sedimentary
Sandstone with Liesegang Rings
Liesegang-banded Sandstone
Hardness: 6-7 (Mohs scale); Color: Tan/brown base with reddish-brown rings; Luster: Dull to earthy; Crystal structure: Granular (clastic); Cleavage: None; Specific gravity: approx. 2.2-2.8.
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan/brown base with reddish-brown rings
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan/brown base with reddish-brown rings; Luster: Dull to earthy; Crystal structure: Granular (clastic); Cleavage: None; Specific gravity: approx. 2.2-2.8.
Formation & geological history
Formed through chemical precipitation of minerals (usually iron oxides like hematite or limonite) from groundwater flowing through porous sedimentary rock. These rhythmic rings develop via a supersaturation-nucleation-depletion cycle.
Uses & applications
Commonly used as ornamental stone, decorative garden rocks, or for geological education. Large slabs are used in building facades.
Geological facts
Liesegang rings are named after the German chemist Raphael E. Liesegang, who first observed the phenomenon in gels in 1896. They occur in many types of rocks but are most spectacular in porous sandstones.
Field identification & locations
Identify by the distinct, non-concentric concentric or nested bands of color that do not follow the rock's original bedding layers. Commonly found in arid or semi-arid regions with iron-rich groundwater.
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