metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
Hardness: 6.5-7.0 (Mohs); Color: Golden yellow to silky brown; Luster: Silky; Crystal structure: Trigonal (fibrous); Cleavage: None; Specific gravity: 2.64-2.71.
- Hardness
- 6
- Color
- Golden yellow to silky brown
- Luster
- Silky
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Physical properties
Hardness: 6.5-7.0 (Mohs); Color: Golden yellow to silky brown; Luster: Silky; Crystal structure: Trigonal (fibrous); Cleavage: None; Specific gravity: 2.64-2.71.
Formation & geological history
Formed when quartz replaces the fibrous mineral crocidolite (blue asbestos) through a process of silicone dioxide infiltration, while maintaining the original fibrous structure. Most deposits are Proterozoic in age.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular meditation or 'healing' stone in metaphysical circles.
Geological facts
The characteristic 'cat's eye' effect is called chatoyancy, caused by the reflection of light off the parallel fibrous inclusions. When heated, the iron oxides turn red, creating 'Red Tiger\'s Eye'.
Field identification & locations
Identified by its signature bands of golden yellow and dark brown with a silky, moving shimmer when rotated. Major sources include South Africa, Western Australia, India, and Burma.
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