mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 7 Mohs; Color: Golden to red-brown; Luster: Silky; Crystal system: Trigonal (fibrous structure); Cleavage: None; Specific Gravity: 2.64-2.71; Notable chatoyancy (cat-eye effect).
- Hardness
- 7 Mohs
- Color
- Golden to red-brown
- Luster
- Silky
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Physical properties
Hardness: 7 Mohs; Color: Golden to red-brown; Luster: Silky; Crystal system: Trigonal (fibrous structure); Cleavage: None; Specific Gravity: 2.64-2.71; Notable chatoyancy (cat-eye effect).
Formation & geological history
Formed when silica-rich fluids replace fibrous crocidolite (asbestos) crystals over millions of years through a process called pseudomorphism. It is primarily found in Metamorphic rocks, specifically banded iron formations.
Uses & applications
Extensively used in jewelry (beads, cabochons, rings), ornamental carvings, and as a popular pocket stone for collectors.
Geological facts
The chatoyant 'cat-eye' effect is caused by the parallel growth of quartz crystals and altered amphibole fibers. It is considered a protective stone in various cultural traditions.
Field identification & locations
Identified by its distinctive golden-brown bands and the way light reflects off its silky fibrous structure when rotated. It is most abundantly sourced from the Northern Cape Province in South Africa and Western Australia.
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