gemstone
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7.0 (Mohs scale), Color: Golden to red-brown, Luster: Silky, Crystal Structure: Hexagonal (trigonal), Cleavage: None, Specific Gravity: 2.64-2.71, Feature: Chatoyancy (cat's eye effect)
- Hardness
- 6
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Physical properties
Hardness: 6.5-7.0 (Mohs scale), Color: Golden to red-brown, Luster: Silky, Crystal Structure: Hexagonal (trigonal), Cleavage: None, Specific Gravity: 2.64-2.71, Feature: Chatoyancy (cat's eye effect)
Formation & geological history
Formed when quartz replaces the mineral crocidolite (blue asbestos) while maintaining its fibrous structure; primarily found in iron-rich sedimentary formations of Precambrian age.
Uses & applications
Commonly used in jewelry (beads, cabochons), carvings, decorative ornaments, and as a popular collector's pocket stone.
Geological facts
It is a member of the chalcedony family. The unique 'cat's eye' effect is caused by the reflection of light off the parallel fibers of the replaced mineral within the quartz matrix.
Field identification & locations
Identified by its distinctive golden-brown bands and moving light reflection when rotated. Major deposits are found in South Africa, Western Australia, India, and Burma.
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