metamorphic
Tiger's Eye
Silicified Crocidolite (Silicon Dioxide - SiO2)
Hardness: 6.5-7.0 (Mohs); Color: Golden to reddish-brown; Luster: Silky; Crystal Structure: Trigonal (fibrous texture); Specific Gravity: 2.64-2.71; Notable chatoyancy effect.
- Hardness
- 6
- Color
- Golden to reddish-brown
- Luster
- Silky
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Physical properties
Hardness: 6.5-7.0 (Mohs); Color: Golden to reddish-brown; Luster: Silky; Crystal Structure: Trigonal (fibrous texture); Specific Gravity: 2.64-2.71; Notable chatoyancy effect.
Formation & geological history
Formed through a pseudomorph process where silica (quartz) replaces fibrous crocidolite (blue asbestos). It typically occurs in iron-rich metamorphic rocks formed during the Proterozoic era.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, charms, and collected for its unique chatoyancy or metaphysical beliefs.
Geological facts
Tiger's Eye is a classic example of a pseudomorph. If the iron oxidation is incomplete, it results in blue 'Hawk's Eye'. It has been worn as a protective talisman throughout history, notably by Roman soldiers.
Field identification & locations
Identify in the field by the 'shimmer' or moving band of light (chatoyancy) when rotated under a light source. Commonly found in South Africa (Griquatown), Western Australia, India, and Myanmar.
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