sedimentary
Zebra Stone (Silicified Siltstone)
Silicified Siltstone with Quartz/Kaolinite inclusions
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
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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.
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