mineral
Tiger's Eye
Quartz Pseudomorph (SiO2 with inclusions of Crocidolite)
Mohs hardness: 6.5-7; Color: golden-brown to red-brown; Luster: silky; Structure: Trigonal (fibrous); Specific Gravity: 2.64-2.71; Notable for chatoyancy.
- Hardness
- 6
- Color
- golden-brown to red-brown
- Luster
- silky
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Physical properties
Mohs hardness: 6.5-7; Color: golden-brown to red-brown; Luster: silky; Structure: Trigonal (fibrous); Specific Gravity: 2.64-2.71; Notable for chatoyancy.
Formation & geological history
Formed when iron-rich quartz replaces the fibrous mineral crocidolite through a process called pseudomorphism. Primarily ancient Proterozoic formations.
Uses & applications
Used extensively in jewelry for cabochons and beads, ornamental carvings, and as a popular palm stone for collectors.
Geological facts
Tiger's eye demonstrates a unique optical effect called chatoyancy (cat's eye effect) caused by the parallel arrangement of its internal fibers.
Field identification & locations
Identify by rotating the stone in light to see moving bands of luster. Commonly found in South Africa and Western Australia.
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