metamorphic
Tiger's Eye (Oeil de Tigre)
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
Hardness: 7 (Mohs); Color: Golden yellow to brown; Luster: Silky; Crystal structure: Hexagonal/Trigonal (fibrous texture); Cleavage: None; Specific gravity: 2.64–2.71
- Hardness
- 7 (Mohs)
- Color
- Golden yellow to brown
- Luster
- Silky
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Physical properties
Hardness: 7 (Mohs); Color: Golden yellow to brown; Luster: Silky; Crystal structure: Hexagonal/Trigonal (fibrous texture); Cleavage: None; Specific gravity: 2.64–2.71
Formation & geological history
Formed through the pseudomorphism of crocidolite (asbestos) into quartz. Iron oxides remain, providing the characteristic yellow-gold color. Generally associated with ancient metamorphic rock formations.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collector specimen for its chatoyancy.
Geological facts
It exhibits 'chatoyancy', a cat-eye effect caused by the reflection of light off parallel fibrous inclusions within the quartz. While usually found in South Africa and Australia, users often find similar looking silicified ironstones or cherts globally.
Field identification & locations
Identify by its distinct silky luster and the way bands of light move across the surface when tilted. Note: Location 48.8°N, 67.5°W (Quebec) is more known for igneous/sedimentary rocks; visual evidence suggests an imported or commercially tumbled specimen if confirmed as true Tiger's Eye.
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