metamorphic
Tiger's Eye
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 when quartz replaces fibrous crocidolite (blue asbestos) via pseudomorphism. It maintains the fibrous structure but is chemically quartz. Primarily found in iron formations.
Uses & applications
Predominantly used for jewelry (cabochons, beads), decorative carvings, and as a popular collector's gemstone due to its chatoyancy.
Geological facts
The distinct shimmering effect is called 'chatoyancy' or the 'cat-eye effect.' It is often heat-treated to produce Red Tiger's Eye.
Field identification & locations
Identify by its golden-brown bands and the 'moving' light effect when rotated. Major deposits are located in South Africa and Western Australia.
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