metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 (Mohs scale), Color: Golden to red-brown, Luster: Silky/Vitreous, Structure: Trigonal (fibrous texture), Cleavage: None, Specific Gravity: 2.64-2.71
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Golden to red-brown, Luster: Silky/Vitreous, 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 pseudomorph process happens over millions of years under high pressure and heat in metamorphic environments.
Uses & applications
Primarily used as a semiprecious stone in jewelry (beads, cabochons), carvings, and decorative ornaments. It is a popular material for tumbling and crystal healing collections.
Geological facts
Exhibits a optical effect known as chatoyancy (cat's-eye effect). Historically, Roman soldiers wore it for protection in battle. If the material is oxidized, it turns red (Bull's Eye); if it remains blue/grey, it is called Hawk's Eye.
Field identification & locations
Identify in the field by its distinct silky luster and moving bands of light (chatoyancy) when rotated. Found commonly in South Africa, Australia, Burma, and Namibia. Collectors look for high contrast in banding.
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