metamorphic
Zebra Marble
Metamorphosed Alabaster/Limestone (CaCO3)
Hardness: 3-4 (Mohs scale); Color: White or cream with gray-black wavy streaks; Luster: Dull to pearly; Crystal structure: Trigonal/Microcrystalline; Cleavage: Perfect rhombohedral (not visible in tumbled state); Specific gravity: 2.7
- Hardness
- 3-4 (Mohs scale)
- Color
- White or cream with gray-black wavy streaks
- Luster
- Dull to pearly
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Physical properties
Hardness: 3-4 (Mohs scale); Color: White or cream with gray-black wavy streaks; Luster: Dull to pearly; Crystal structure: Trigonal/Microcrystalline; Cleavage: Perfect rhombohedral (not visible in tumbled state); Specific gravity: 2.7
Formation & geological history
Formed through the regional metamorphism of sedimentary limestone or dolomite rocks. High pressure and heat cause recrystallization of calcite. The dark patterns are typically caused by organic matter or trace minerals like graphite or manganese caught in the original sediment layers.
Uses & applications
Used primarily for decorative purposes, including ornamental carvings, beads for jewelry, tumbled pocket stones for crystal healing, and architectural accents like floor tiles or bathroom vanities.
Geological facts
Zebra Marble is often used in lithotherapy (alternative medicine) where it is believed to enhance balance and stability. Geologically, it is a great example of how tectonic forces can 'fold' and stretch mineral veins to create distinctive patterns.
Field identification & locations
Identify in the field by its distinct high-contrast banding and 'waxy' feel when polished. It will react and fizz if a drop of weak hydrochloric acid (or vinegar) is applied due to its calcium carbonate content. Common in mountainous regions with historical tectonic activity.
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