sedimentary

Sandstone with Concretions / Liesegang Rings

Arenite with iron oxide banding

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Tan, beige, grey with brown or curved banding; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Tan, beige, grey with brown or curved banding
Luster: Dull/Earthy

Identified May 16, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, beige, grey with brown or curved banding; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The distinct curved patterns (Liesegang rings) are secondary chemical precipitates formed as mineral-rich groundwater moves through the porous rock, often during the late stages of lithification.

Uses & applications

Building stone, paving, industrial sand for glass making, and as a decorative specimen for geological hobbyists.

Geological facts

The swirling patterns are often mistaken for fossils, like wood or shells, but are actually geochemical in origin. They represent rhythmic precipitation within a fluid-saturated rock matrix.

Field identification & locations

Identify in the field by the sandpaper-like texture and visual bands that cut across horizontal bedding lanes. Commonly found in arid or coastal regions with ancient sedimentary basins.