sedimentary

Sandstone with Liesegang Rings

Arenite with secondary Iron oxide (Limonite/Goethite) precipitation

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale (due to quartz grains); Color: Tan to yellowish-brown with dark reddish-brown concentric bands; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale (due to quartz grains)
Luster: Dull/Earthy

Identified March 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the lithification of sand-sized grains over millions of years. The distinctive colored bands, known as Liesegang Rings, are formed by the rhythmic precipitation of iron-rich fluids infiltrating the porous rock after deposition.

Uses & applications

Primarily used as decorative landscaping stones, architectural cladding, and as a educational specimen for demonstrating chemical precipitation in geology.

Geological facts

Liesegang rings are named after the chemist Raphael E. Liesegang. These patterns are a classic example of a self-organizing chemical system that moves through a porous medium over geological timescales.

Field identification & locations

Identify in the field by looking for rounded, water-worn cobbles with visible sand grains and 'bullseye' or concentric banding. Commonly found in riverbeds where sedimentary formations are being eroded. Collectors should look for high-contrast banding.