metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide)
Hardness: 6.5-7 (Mohs); Color: Golden-brown to yellow-gold; Luster: Silky; Crystal Structure: Trigonal (fibrous texture); Cleavage: None; Specific Gravity: 2.64-2.71.
- Hardness
- 6
- Color
- Golden-brown to yellow-gold
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Golden-brown to yellow-gold; Luster: Silky; Crystal Structure: Trigonal (fibrous texture); Cleavage: None; Specific Gravity: 2.64-2.71.
Formation & geological history
Formed through the pseudomorphism of crocidolite (asbestos) fibers into quartz, maintaining the fibrous structure while replacing the material. Typically found in Precambrian iron formations (Proterozoic era).
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular meditation stone in metaphysical practices.
Geological facts
Exhibits a unique optical effect known as 'chatoyancy' or the 'cat's eye effect.' When heat-treated, it can turn red (Bull's Eye), and a grey-blue naturally occurring variety is known as Hawk's Eye.
Field identification & locations
Identify by its distinctive bands of gold and brown that shimmer when rotated under light. Commonly found in South Africa, Western Australia, India, and Myanmar. Collector's tip: look for high-contrast bands and a smooth, waxy-to-silky polish.
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