metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 Mohs; Color: Golden brown to yellowish brown with chatoyant stripes; Luster: Silky; Crystal System: Trigonal; Cleavage: None; Specific Gravity: 2.64-2.71
- Hardness
- 6
- Color
- Golden brown to yellowish brown with chatoyant stripes
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 Mohs; Color: Golden brown to yellowish brown with chatoyant stripes; Luster: Silky; Crystal System: Trigonal; Cleavage: None; Specific Gravity: 2.64-2.71
Formation & geological history
Formed through the pseudomorphism of crocidolite asbestos fibers by chalcedony quartz. Heat and pressure during metamorphism alter the mineral while preserving the fibrous structure. Primarily found in South Africa and Western Australia.
Uses & applications
Used extensively in jewelry for cabochons, beads, and carvings. Also used as an ornamental stone and in metaphysical practices as a protective stone.
Geological facts
Tiger's eye exhibits a unique optical effect known as chatoyancy, or the 'cat-eye effect', caused by the parallel reflection of light off the internal fibrous structure. If it undergoes further heating, it can turn red (Ox Eye/Bull Eye).
Field identification & locations
Identified by its distinctive golden-brown bands and shifting tiger-like shimmer when rotated under light. Collectors should look for sharp chatoyancy and consistent coloring without dark inclusions.
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