mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 Mohs; Color: Golden-brown to yellow with chatoyancy; Luster: Silky to vitreous; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific gravity: 2.64-2.71
- Hardness
- 6
- Color
- Golden-brown to yellow with chatoyancy
- Luster
- Silky to vitreous
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Physical properties
Hardness: 6.5-7 Mohs; Color: Golden-brown to yellow with chatoyancy; Luster: Silky to vitreous; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific gravity: 2.64-2.71
Formation & geological history
Formed when silica-rich fluids replace the fibrous mineral crocidolite (blue asbestos) while retaining its fibrous structure, a process known as pseudomorphism. Most deposits are found in Precambrian metamorphic rocks.
Uses & applications
Extensively used in jewelry (cabochons, beads), decorative carvings, and as a popular collected gemstone for its chatoyant optical effect.
Geological facts
The chatoyancy (cat's-eye effect) is caused by the parallel reflection of light off the internal fibrous structure. It was once considered a rare and highly valuable gemstone in the late 19th century until large deposits were found in South Africa.
Field identification & locations
Identified by its distinctive yellowish-brown bands and silky, shimmering effect when moved under light. Major sources include South Africa, Australia, Burma, and India.
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