sedimentary
Zebra Jasper
Tectonized Jasper (Silicon Dioxide, SiO2)
Hardness: 6.5-7 (Mohs scale), Color: Greenish-gray with white/cream vertical banding, Luster: Vitreous to dull, Crystal Structure: Microcrystalline/Trigonal, Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Greenish-gray with white/cream vertical banding, Luster: Vitreous to dull, Crystal Structure: Microcrystalline/Trigonal, Specific Gravity: 2.6-2.9
Formation & geological history
Formed through the compaction of silica-rich sediments and microcrystalline quartz. The 'zebra' banding is a result of structural or metamorphic stress-related tectonization or rhythmic deposition over millions of years.
Uses & applications
Commonly used in lapidary arts for cabochons, beads, decorative carvings, bowl inlays, and as polished pocket stones.
Geological facts
Despite being called 'jasper', many zebra-patterned stones are actually varieties of metamorphosed siltstone or marble, but this specific specimen exhibits the cherty fracture of true jasper.
Field identification & locations
Identified by its distinctive rhythmic parallel banding and high hardness (cannot be scratched by a steel knife). Commonly found in Australia, Africa, and Russia. Collectors should look for sharp color contrast.
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