metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)
Hardness: 6.5-7.0 (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: 6.5-7.0 (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 a pseudomorphic process where silica (quartz) replaces fibrous crocidolite (blue asbestos) crystals while maintaining the original fibrous structure. The chatoyance results from the reflection of light off these parallel fibers.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular lapidary material for collectors.
Geological facts
Tiger's Eye is known for its chatoyancy, an optical effect also known as the 'cat's eye effect.' Historically, it was worn as a protective amulet against curses and ill wishes.
Field identification & locations
Identify by its distinct golden-yellow and dark brown bands and its silky chatoyance when rotated under light. Major deposits are found in South Africa, Australia, and India.
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