sedimentary

Zebra Stone (Silicified Siltstone)

Silicified Siltstone with Quartz/Kaolinite inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Brown, grey, or reddish-brown base with white/cream bands; Luster: Dull to sub-vitreous; Structure: Fine-grained clastic

Hardness: 6
Color: Brown, grey, or reddish-brown base with white/cream bands
Luster: Dull to sub-vitreous

Identified June 2, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Brown, grey, or reddish-brown base with white/cream bands; Luster: Dull to sub-vitreous; Structure: Fine-grained clastic

Formation & geological history

Formed over 600 million years ago during the Proterozoic era. The patterns were created by the rhythmic precipitation of iron oxide and other minerals through underground fluids within the siltstone layers.

Uses & applications

Primarily used for decorative purposes, including cabochons, jewelry, carvings, and as pocket stones for collectors.

Geological facts

This specimen is often confused with 'Zebra Jasper' from Australia, but it is technically a siltstone that has been impregnated with silica. The bands can sometimes resemble landscape patterns.

Field identification & locations

Identify in the field by its distinct, non-concentric banding and smooth, river-worn texture when found in alluvial deposits. Common in regions with ancient sedimentary basins.