sedimentary

Banded Sandstone

Arenite (with iron oxide banding)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: Cream, tan, and reddish-brown, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8

Identified May 10, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: Cream, tan, and reddish-brown, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8

Formation & geological history

Formed via the accumulation and cementation of mineral particles or rock fragments. The distinct banding (Liesegang rings) is caused by the precipitation of minerals, typically iron oxides, from groundwater moving through porous rock over geological time.

Uses & applications

Used in construction for cladding, paving, and decorative garden features. High-quality banded specimens are used for lapidary work such as coasters, paperweights, and cabochons.

Geological facts

The rhythmic banding patterns are often mistaken for tree rings or fossils, but they are chemical precipitation phenomena. Famous locations include the 'Wonderstone' deposits in Utah, USA.

Field identification & locations

Identify by the gritty texture (like sandpaper) and visible layers or rings. Found globally in ancient riverbeds, deserts, and coastal areas. Collectors value specimens with high contrast and geometric patterns.