metamorphic
Tiger's Eye
Pseudomorph of quartz after crocidolite (SiO2 with iron inclusions)
Hardness: 7 on Mohs scale; Color: Golden-yellow to deep brown with silky chatoyant bands; Luster: Silky; Crystal System: Trigonal; Cleavage: None; Specific Gravity: 2.64–2.71
- Hardness
- 7 on Mohs scale
- Color
- Golden-yellow to deep brown with silky chatoyant bands
- Luster
- Silky
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Physical properties
Hardness: 7 on Mohs scale; Color: Golden-yellow to deep brown with silky chatoyant bands; Luster: Silky; Crystal System: Trigonal; Cleavage: None; Specific Gravity: 2.64–2.71
Formation & geological history
Formed through the metamorphic process known as pseudomorphism, where quartz replaces the fibrous mineral crocidolite (blue asbestos) while retaining its fibrous structure. Most deposits are Proterozoic in age (approx. 2 billion years old).
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular semi-precious stone for collectors and metaphysical practitioners.
Geological facts
The optical effect seen in Tiger's Eye is called chatoyancy, or the 'cat's eye' effect. When the iron inclusions are oxidized, the stone turns gold-brown; if low oxidation occurs, it remains blue (known as Hawk's Eye).
Field identification & locations
Identify by its unique 'moving' light bands when rotated. It is commonly found in large deposits in South Africa, Western Australia, India, and Burma. Collectors should look for vibrant color contrast and sharp, centered chatoyancy.
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