metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
Hardness: 6.5–7 on Mohs scale; Color: Golden yellow to deep brown; Luster: Silky; Crystal structure: Trigonal (fibrous texture); 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 on Mohs scale; Color: Golden yellow to deep brown; Luster: Silky; Crystal structure: Trigonal (fibrous texture); Cleavage: None; Specific gravity: 2.64–2.71.
Formation & geological history
Formed through the pseudomorphism of crocidolite (blue asbestos) fibers by silica. Iron oxides provide the golden coloration. It occurs within metamorphic environments, often associated with Precambrian formations.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular semi-precious gemstone for collectors and metaphysical practitioners.
Geological facts
It is famous for its 'chatoyancy' (cat's eye effect), which is caused by the reflection of light off the internal fibrous structure. Unlike Blue Tiger's Eye (Hawk's Eye), the golden version has undergone oxidation of the iron.
Field identification & locations
Identify in the field by its distinctive 'shimmer' or moving band of light when rotated under a light source. Commonly found in South Africa (Northern Cape), Western Australia, India, and Namibia.
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