metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5–7 (Mohs scale); Color: Golden yellow to deep brown; Luster: Silky; Crystal Structure: Trigonal (fibrous); Cleavage: None; Specific Gravity: 2.64–2.71
- Hardness
- 6
- Color
- Golden yellow to deep brown
- Luster
- Silky
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Physical properties
Hardness: 6.5–7 (Mohs scale); Color: Golden yellow to deep brown; Luster: Silky; Crystal Structure: Trigonal (fibrous); Cleavage: None; Specific Gravity: 2.64–2.71
Formation & geological history
Formed through the metamorphic transformation of fibrous blue crocidolite asbestos by silica. The silica replaces the asbestos fibers while maintaining the original fibrous structure. Most deposits are found in Precambrian iron formations.
Uses & applications
Primarily used for jewelry (cabochons, beads), decorative carvings, ornamental handles, and as a popular specimen for crystal healing and metaphysical collections.
Geological facts
It exhibits a unique optical phenomenon called 'chatoyancy' or the 'cat-eye effect,' caused by the reflection of light off the internal fibrous structure. Roman soldiers carried it for protection during battle.
Field identification & locations
Identify in the field by its distinct alternating bands of yellow and brown and its chatoyant 'shifting' light effect when rotated. Common locations include South Africa (Northern Cape), Western Australia, India, and Burma.
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