metamorphic
Tiger's Eye
Pseudomorph of quartz after crocidolite (SiO2)
Hardness: 7 Mohs; Color: golden brown to yellow; Luster: silky; Crystal structure: Trigonal (fibrous); Specific gravity: 2.64-2.71; Chatoyancy (cat-eye effect).
- Hardness
- 7 Mohs
- Color
- golden brown to yellow
- Luster
- silky
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Physical properties
Hardness: 7 Mohs; Color: golden brown to yellow; Luster: silky; Crystal structure: Trigonal (fibrous); Specific gravity: 2.64-2.71; Chatoyancy (cat-eye effect).
Formation & geological history
Formed when quartz replaces parallel fibers of crocidolite asbestos through a process called pseudomorphism, usually in iron-rich metamorphic environments.
Uses & applications
Primarily used in jewelry for cabochons and beads, as well as carvings, talismans, and decorative ornamental objects.
Geological facts
It is famous for its chatoyancy, an optical effect where light reflects off the fibrous inclusions to create a mobile silky sheen. It is often found associated with 'Tiger Iron'.
Field identification & locations
Identify in the field by its distinct golden-brown fibrous banding and the shifting movement of light when the stone is tilted. Common in South Africa and Western Australia.
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