sedimentary
Zebra Jasper
Tainted Silicate (mainly Quartz/Chalcedony/Calcite)
Hardness: 6.5-7 (Mohs); Color: Alternating bands of black/dark grey and white/cream; Luster: Vitreous to waxy (when polished); Structure: Cryptocrystalline; Specific Gravity: 2.6-2.9.
- Hardness
- 6
- Color
- Alternating bands of black/dark grey and white/cream
- Luster
- Vitreous to waxy (when polished)
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Alternating bands of black/dark grey and white/cream; Luster: Vitreous to waxy (when polished); Structure: Cryptocrystalline; Specific Gravity: 2.6-2.9.
Formation & geological history
Formed from the deposition of silica-rich marine sediments or volcanic ash that undergoes compaction and cementation over millions of years. The banding is often a result of rhythmic sedimentation or fluid flow during metamorphism/diagenesis.
Uses & applications
Primarily used for lapidary work including cabochons, beads, decorative carvings, and pocket stones. It is also a popular specimen for metaphysical collections.
Geological facts
Despite the name, some 'Zebra Jaspers' are actually types of marble or banded calcite, but the most common commercial variety is a silicate rock. It is often referred to as a stone of balance.
Field identification & locations
Identified by its distinctive high-contrast striped patterns resembling a zebra. Found commonly in Brazil, Africa (South Africa/Madagascar), and India. Collectors value crisp, clear banding without blurring.
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