metamorphic
Zebra Marble
Metamorphosed Limestone (Recrystallized Calcite)
Hardness: 3 on Mohs scale; Color: Black and white foliated bands; Luster: Dull to sub-vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: Perfect rhombohedral (not visible in tumbled form); Specific Gravity: 2.7
- Hardness
- 3 on Mohs scale
- Color
- Black and white foliated bands
- Luster
- Dull to sub-vitreous
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Physical properties
Hardness: 3 on Mohs scale; Color: Black and white foliated bands; Luster: Dull to sub-vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: Perfect rhombohedral (not visible in tumbled form); Specific Gravity: 2.7
Formation & geological history
Formed from the regional metamorphism of limestone or dolostone under high temperature and pressure, causing recrystallization of carbonate minerals and segregation of impurities into dark bands.
Uses & applications
Used in decorative landscaping, home decor, tumbled stones for collecting, and metaphysical jewelry.
Geological facts
The 'zebra' pattern is caused by the alignment of impurities such as graphite or organic carbon during the metamorphic process. It is a popular 'worry stone' material due to its smooth texture when polished.
Field identification & locations
Identify by its characteristic high-contrast black and white swirling bands and its ability to be scratched by a steel nail (unlike agate). Common in mountainous regions with a history of tectonic activity.
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