metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 (Mohs); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal (fibrous texture); Cleavage: None; Specific gravity: 2.64-2.71
- Hardness
- 6
- Color
- Golden to red-brown
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal (fibrous texture); Cleavage: None; Specific gravity: 2.64-2.71
Formation & geological history
Formed through the replacement of fibrous crocidolite asbestos by silica (quartz). This process creates a metamorphic rock with chatoyancy. Most deposits are billions of years old.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock collectors.
Geological facts
It exhibits a unique optical effect known as chatoyancy, or the 'cat-eye effect,' caused by light reflecting off the parallel fibrous structure within the stone.
Field identification & locations
Identified by its distinctive golden-brown bands and the way the light moves across the fibers when rotated. Commonly found in South Africa, Australia, and Brazil.
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