metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5–7 (Mohs scale); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; 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 (Mohs scale); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific gravity: 2.64–2.71.
Formation & geological history
Formed through the replacement of fibrous crocidolite (blue asbestos) with silica (quartz) while retaining the original fibrous structure. Most deposits are approximately 2 billion years old.
Uses & applications
Primarily used for lapidary purposes, jewelry (cabochons and beads), talismans, and ornamental carvings.
Geological facts
It exhibits a phenomenon called chatoyancy, which creates a 'cat's eye' effect as light reflects off the fibrous inclusions. It is considered a classic example of a pseudomorph.
Field identification & locations
Identify by its silky luster and band-like light reflection that shifts when the stone is rotated. Commonly found in South Africa, Australia, and Brazil. Collectors should look for sharp, distinct chatoyant bands.
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