metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 7 Mohs; Color: Golden to red-brown; Luster: Silky; Structure: Trigonal (fibrous); Specific Gravity: 2.64-2.71; Notable for chatoyancy.
- Hardness
- 7 Mohs
- Color
- Golden to red-brown
- Luster
- Silky
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Physical properties
Hardness: 7 Mohs; Color: Golden to red-brown; Luster: Silky; Structure: Trigonal (fibrous); Specific Gravity: 2.64-2.71; Notable for chatoyancy.
Formation & geological history
Formed through the pseudomorphism of blue asbestos (crocidolite) fibers by silica. As the iron oxidizes, it turns the original blue mineral to gold or brown. Primary sources date back to the Precambrian era.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collectible gemstone due to its chatoyant effect.
Geological facts
It is a 'pseudomorph', meaning one mineral has replaced another while retaining the original mineral's shape. The name comes from its resemblance to the eye of a tiger or cat.
Field identification & locations
Identify by its distinct golden-brown banded pattern and silky 'moving' light effect when rotated. Commonly found in South Africa and Western Australia. Collectors look for sharp, distinct chatoyancy.
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