Mineral
Tiger's Eye
Silicon dioxide (SiO2) with crocidolite inclusions
Hardness: 6.5-7.0 (Mohs scale), Color: Golden to red-brown, Luster: Silky/Vitreous, Crystal Structure: Trigonal (fibrous), Cleavage: None, Specific Gravity: 2.64-2.71
- Hardness
- 6
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Physical properties
Hardness: 6.5-7.0 (Mohs scale), Color: Golden to red-brown, Luster: Silky/Vitreous, Crystal Structure: Trigonal (fibrous), Cleavage: None, Specific Gravity: 2.64-2.71
Formation & geological history
Formed as a pseudomorph when quartz replaces fibrous crocidolite (blue asbestos) through hydrothermal processes, often found in Precambrian iron formations.
Uses & applications
Predominantly used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for crystal collecting.
Geological facts
It exhibits a unique optical effect known as chatoyancy (cat-eye effect), where light reflects off the parallel internal fibers. Red varieties are often heat-treated to enhance their color.
Field identification & locations
Identify in the field by its distinct alternating bands of gold and brown and its characteristic shimmer when tilted. Common locations include South Africa, Western Australia, USA, and Myanmar.
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