metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
Hardness: 7 (Mohs scale); Color: Golden yellow to brown with chatoyant bands; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None (conchoidal fracture); Specific gravity: 2.64–2.71
- Hardness
- 7 (Mohs scale)
- Color
- Golden yellow to brown with chatoyant bands
- Luster
- Silky
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Physical properties
Hardness: 7 (Mohs scale); Color: Golden yellow to brown with chatoyant bands; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None (conchoidal fracture); Specific gravity: 2.64–2.71
Formation & geological history
Formed through the pseudomorphism of crocidolite asbestos by silica. Over millions of years, quartz replaces the asbestos fibers while preserving the fibrous structure, creating a chatoyant effect. Major deposits are found in Precambrian rock formations roughly 2 billion years old.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for crystal healing and mineral collectors.
Geological facts
The word 'Tiger's Eye' comes from the stone's resemblance to the eye of a tiger or cat. It exhibits a unique optical effect known as chatoyancy, where a band of light moves across the surface as the stone is rotated. Roman soldiers used to wear it for protection in battle.
Field identification & locations
Identify in the field by its distinct golden-to-brown stripes and 'cat's eye' shimmer when moved under light. It is commonly found in South Africa (Northern Cape), Western Australia, India, and Myanmar. For collectors, look for high-contrast banding and 'flash'.
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