metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
Hardness: 6.5-7.0 (Mohs scale); Color: Golden yellow to deep brown; Luster: Silky; Crystal structure: Trigonal (fibrous habit); Cleavage: None; Specific gravity: 2.64-2.71
- Hardness
- 6
- Color
- Golden yellow to deep brown
- Luster
- Silky
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Physical properties
Hardness: 6.5-7.0 (Mohs scale); Color: Golden yellow to deep brown; Luster: Silky; Crystal structure: Trigonal (fibrous habit); Cleavage: None; Specific gravity: 2.64-2.71
Formation & geological history
Formed through a metamorphic process where quartz replaces fibrous blue crocidolite (asbestos) through pseudomorphism, maintaining the original fibrous structure. Iron within the mineral oxidizes to create the distinctive golden-brown bands.
Uses & applications
Predominantly used as a gemstone for jewelry (cabochons, beads), decorative carvings, and in metaphysical collecting.
Geological facts
It exhibits a unique optical effect known as chatoyancy (cat's eye effect) caused by light reflecting off the internal fibers. Historically, Roman soldiers wore it for protection in battle.
Field identification & locations
Identify by its alternating bands of gold and brown and its characteristic silky, chatoyant shimmer when rotated under light. Major deposits are found in South Africa and Western Australia.
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