metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)
Hardness: 6.5-7 (Mohs); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific Gravity: 2.64-2.71
- Hardness
- 6
- Color
- Golden to red-brown
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific Gravity: 2.64-2.71
Formation & geological history
Formed through the replacement of fibrous blue crocidolite asbestos by silica (quartz) while retaining the fibrous structure, resulting in chatoyancy. They are typically Precambrian in age.
Uses & applications
Extensively used in jewelry (cabochons, beads), decorative carvings, and as a popular semi-precious stone for metaphysical collecting.
Geological facts
The name 'Tiger's Eye' comes from its resemblance to the eye of a tiger or cat. When it is blue-grey, it is known as Hawk's Eye. It is a classic example of a pseudomorph.
Field identification & locations
Identify by its distinctive silky luster and bands of chatoyancy that 'shimmer' as the stone is turned. It is primarily mined in South Africa and Western Australia.
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