metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 7 Mohs; Color: Golden-brown to yellow-gold; Luster: Silky; Crystal structure: Trigonal (fibrous texture); Cleavage: None; Specific gravity: 2.64-2.71
- Hardness
- 7 Mohs
- Color
- Golden-brown to yellow-gold
- Luster
- Silky
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Physical properties
Hardness: 7 Mohs; Color: Golden-brown to yellow-gold; Luster: Silky; Crystal structure: Trigonal (fibrous texture); Cleavage: None; Specific gravity: 2.64-2.71
Formation & geological history
Formed when quartz replaces crocidolite (blue asbestos) fibers through a process called pseudomorphism, retaining the fibrous structure and creating chatoyancy. It occurs in metamorphosed iron formations.
Uses & applications
Predominantly used in jewelry (beads, cabochons), ornamental carvings, and widely used as a healing stone in metaphysical practices.
Geological facts
The unique shimmer is known as 'chatoyancy' or the 'cat-eye effect'. It is often associated with the 'all-seeing eye' and has been used throughout history as a protective amulet against the 'evil eye'.
Field identification & locations
Identified by its distinctive gold and brown stripes and the way light reflects off the fibrous parallel inclusions when rotated. It is commonly found in South Africa, Australia, and India.
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