metamorphic
Tiger's Eye
Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2
Hardness: 6.5-7.0 (Mohs); Color: golden yellow to honey brown; Luster: silky; Crystal Structure: Trigonal (fibrous); Cleavage: none; Specific Gravity: 2.64-2.71
- Hardness
- 6
- Color
- golden yellow to honey brown
- Luster
- silky
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Physical properties
Hardness: 6.5-7.0 (Mohs); Color: golden yellow to honey brown; Luster: silky; Crystal Structure: Trigonal (fibrous); Cleavage: none; Specific Gravity: 2.64-2.71
Formation & geological history
Forms through the pseudomorphism of crocidolite (blue asbestos) by quartz. The iron from the crocidolite oxidizes to create the yellow-brown color. Found in metamorphic rocks like ferruginous quartzites.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collectible gemstone for lapidary work.
Geological facts
It exhibits a phenomenon called chatoyancy (the 'cat's eye' effect). When the crocidolite is replaced by quartz but the fiber structure remains unoxidized, it forms the blue variety known as Hawk's Eye.
Field identification & locations
Identify by its distinct silky luster and parallel fibrous bands that shift light when rotated. Most famously found in the Northern Cape Province of South Africa and Western Australia.
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