mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 Mohs; Color: Golden brown to brownish yellow with silky luster; Crystal System: Trigonal (fibrous); Specific Gravity: 2.64-2.71; Notable chatoyancy.
- Hardness
- 6
- Color
- Golden brown to brownish yellow with silky luster
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Physical properties
Hardness: 6.5-7 Mohs; Color: Golden brown to brownish yellow with silky luster; Crystal System: Trigonal (fibrous); Specific Gravity: 2.64-2.71; Notable chatoyancy.
Formation & geological history
Formed when quartz replaces crocidolite (blue asbestos) filaments through a process of pseudomorphism, typically in metamorphic environments. It is most commonly associated with the Precambrian period.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular meditation and lapidary stone.
Geological facts
The optical effect 'chatoyancy' is caused by the reflection of light from the parallel fibrous structure within the quartz. It was once considered as valuable as gold back in the late 1800s.
Field identification & locations
Identified by its distinctive golden banding and silky luster that seems to move when the stone is tilted. Found mainly in South Africa (Northern Cape) and Western Australia.
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Mineral/Rock
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