metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5–7 on Mohs scale; Color: Golden-brown to yellow-gold; Luster: Silky; Crystal structure: Hexagonal/Trigonal; Special property: Chatoyancy (the 'cat's eye' effect); Cleavage: None
- Hardness
- 6
- Color
- Golden-brown to yellow-gold
- Luster
- Silky
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Golden-brown to yellow-gold; Luster: Silky; Crystal structure: Hexagonal/Trigonal; Special property: Chatoyancy (the 'cat's eye' effect); Cleavage: None
Formation & geological history
Formed through the metamorphic process known as pseudomorphism, where silicon dioxide (quartz) replaces the fibrous mineral crocidolite (blue asbestos) over millions of years. Most deposits are Proterozoic in age.
Uses & applications
Primarily used in jewelry for cabochons, beads, and pendants. Also popular for decorative carvings, palm stones, and as a 'talisman' in metaphysical practices.
Geological facts
It is a talk-of-the-town 'pseudomorph', meaning it has the chemical composition of one mineral (quartz) but the physical fibrous shape of another (asbestos). It symbolizes courage and protection in various cultures.
Field identification & locations
Identify by its distinct golden-to-brown bands and moving light effect (chatoyancy) when tilted. Major occurrences are in South Africa, Western Australia, India, and Burma. Easily identified by its weight and fibrous visual texture despite being solid stone.
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