metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7.0 (Mohs). Color: Golden yellow to brown with chatoyant bands. Luster: Silky. Crystal Structure: Trigonal (fibrous aggregate). Specific Gravity: 2.64-2.71.
- Hardness
- 6
- Color
- Golden yellow to brown with chatoyant bands
- Luster
- Silky
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Physical properties
Hardness: 6.5-7.0 (Mohs). Color: Golden yellow to brown with chatoyant bands. Luster: Silky. Crystal Structure: Trigonal (fibrous aggregate). Specific Gravity: 2.64-2.71.
Formation & geological history
Formed through a pseudomorph process where silica (Quartz) replaces the fibrous mineral crocidolite (asbestos). It is typically found in metamorphic rock formations like Banded Iron Formations.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for crystal collectors.
Geological facts
Tiger's eye exhibits a unique optical effect called chatoyancy, or the 'cat's eye effect,' caused by the reflection of light off the parallel mineral fibers within the stone.
Field identification & locations
Identify in the field by its distinct golden-brown stripes and silky luster when tilted under light. Most commonly sourced from South Africa, Western Australia, and India.
