mineral
Tiger's Eye
Silicon dioxide with fibrous inclusions (SiO2)
Hardness: 6.5-7 Mohs; Color: Golden to red-brown; Luster: Silky; Chatoyant effect; Crystal system: Trigonal/Fibrous.
- 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; Chatoyant effect; Crystal system: Trigonal/Fibrous.
Formation & geological history
Formed as a pseudomorph when quartz replaces fibrous crocidolite (asbestos) in iron-rich environments, maintaining the original fibrous structure.
Uses & applications
Predominantly used for jewelry, cabochons, carvings, and as a popular collectible specimen.
Geological facts
It is famous for the 'cat's-eye' effect known as chatoyancy, caused by parallel light reflection off its inner fibers. Roman soldiers wore it for protection in battle.
Field identification & locations
Identify by its distinct golden-yellow bands and silky luster that shifts when rotated. Major deposits are in South Africa and Western Australia.
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Arenite (SiO2 based)
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Metamorphic
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metamorphic
Gypsum (variety Selenite or Alabaster)
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Mineral
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Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous