Banded Sandstone (Zebra Stone)

Physical Properties

Hardness: 6-7 on Mohs scale; Color: Alternating bands of reddish-brown, tan, and cream; Luster: Dull/Earthy; Crystal structure: Granular/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 banding (Liesegang rings) is caused by the rhythmic precipitation of iron oxides (hematite/goethite) within the porous stone by groundwater.

Uses & Applications

Commonly used for decorative garden stones, cabochons for jewelry, paperweights, and educational specimens to demonstrate sedimentary layering.

Geological Facts

While often called 'Zebra Stone', true Zebra Stone from Western Australia is much older (Precambrian), whereas general banded sandstone is found globally in various archaeological and geological strata.

Field Identification & Locations

Identify in the field by its gritty texture and visible alternating color layers. Commonly found in arid or semi-arid regions and near ancient riverbeds. Tip: Look for the 'grainy' feel to distinguish it from banded jasper.

Identified on: 4/23/2026

Mode: Standard