metamorphic
Tiger's Eye
Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2
Hardness: 6.5-7 (Mohs scale); Color: Golden yellow to deep brown with silky chatoyancy; Luster: Silky; Crystal structure: Trigonal; Cleavage: None; Specific Gravity: 2.64-2.71
- Hardness
- 6
- Color
- Golden yellow to deep brown with silky chatoyancy
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Golden yellow to deep brown with silky chatoyancy; Luster: Silky; Crystal structure: Trigonal; Cleavage: None; Specific Gravity: 2.64-2.71
Formation & geological history
Formed through the pseudomorphism (replacement) of crocidolite fibers (blue asbestos) by quartz. Iron within the fibers oxidizes to limonite, giving it the golden-brown color. Found in metamorphic formations near iron-rich deposits.
Uses & applications
Used widely in lapidary arts for jewelry (cabochons, beads, rings), decorative carvings, and as a popular collectible 'healing stone'.
Geological facts
Tiger's eye demonstrates a rare optical effect called chatoyancy, or the 'cat-eye effect,' caused by the reflection of light off the parallel mineral fibers. If the iron has not oxidized, the material remains blue and is known as Hawk's Eye.
Field identification & locations
Identify in the field by its distinct golden-to-brown banding and moving shimmer when rotated under light. Major deposits are found in South Africa, Australia, and Namibia.
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