sedimentary

Sandstone with Liesegang Rings

Liesegang-banded Sandstone

AI-generated identification · may be incorrect

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

Identified June 30, 2026More sedimentary →

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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.