sedimentary

Liesegang Banded Sandstone (Concretion / Weathered Pebble)

Sandstone showing Liesegang rings / Weathering rind (SiO2 with iron oxides)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale. Color: Gray core surrounded by concentric rings of tan, brownish-yellow, and orange-red rust hues. Luster: Dull, earthy. Texture: Medium-grained, gritty. Structure: Concentric banding in a water-worn, smooth oval pebble.

Hardness: 6-7 on Mohs scale
Luster: Dull, earthy

Identified July 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed by chemical weathering and fluid movement through porous sedimentary stone (sandstone or siltstone). Iron-rich groundwater diffuses into the rock, reacting with oxygen and precipitating iron oxides (limonite/hematite) in rhythmic concentric bands known as Liesegang rings.

Uses & applications

Mainly collected as decorative natural stones, river rocks, or display pieces for rockhounds and garden landscapes.

Geological facts

Liesegang rings are named after chemist Raphael E. Liesegang, who discovered periodic precipitation in 1896. They mimic tree rings but are caused purely by chemical diffusion dynamics within the porous matrix.

Field identification & locations

Look for smooth, water-rounded pebbles with target-like or bulls-eye concentric discoloration bands. Frequently found along riverbeds, beaches, and eroded sedimentary rock formations. Collectors often value distinct, unbroken rings.