metamorphic
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
Hardness: 3-4 (Mohs scale); Color: Contrasting black and white or dark grey and cream banding; Luster: Dull to vitreous; Crystal structure: Microcrystalline; Cleavage: Poor; Specific gravity: 2.6-2.8
- Hardness
- 3-4 (Mohs scale)
- Color
- Contrasting black and white or dark grey and cream banding
- Luster
- Dull to vitreous
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Physical properties
Hardness: 3-4 (Mohs scale); Color: Contrasting black and white or dark grey and cream banding; Luster: Dull to vitreous; Crystal structure: Microcrystalline; Cleavage: Poor; Specific gravity: 2.6-2.8
Formation & geological history
Formed through regional metamorphism where limestone or clay-bearing sedimentary rocks were subjected to heat and pressure, causing recrystallization and segregation of minerals into alternating bands. Much of this material dates back to the Proterozoic or Paleozoic eras.
Uses & applications
Primarily used for decorative purposes, including ornamental carvings, beads for jewelry, paperweights, and architectural inlay. Larger slabs may be used for tile or countertops.
Geological facts
The striking patterns are often the result of rhythmic precipitation of iron oxides or the segregation of organic carbon/bitumen from calcium carbonate during the metamorphic process.
Field identification & locations
Identified by its distinctive high-contrast stripes. It is commonly found in regions with significant tectonic activity and metamorphic outcrops, such as Western Australia or the Southwestern United States. Collectors look for sharp, clean lines between the color bands.
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