metamorphic
Tiger's Eye
SiO2 (Quartz with inclusions of altered crocidolite)
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 as a pseudomorph when quartz replaces the mineral crocidolite (blue asbestos) via metamorphic processes, retaining the fibrous structure while oxidizing iron to create the golden-brown color.
Uses & applications
Primarily used in jewelry (beads, cabochons), ornamental carvings, and as a popular metaphysical or pocket stone.
Geological facts
The shimmering effect shown is called chatoyancy (the cat's-eye effect). If the iron is not fully oxidized, it remains blue and is called Hawk's Eye.
Field identification & locations
Identify by its distinctive silky luster and moving bands of light (chatoyancy) when tilted. Most commonly found in South Africa, Australia, Burma, and India.
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