metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron Oxide inclusions)
Hardness: 6.5-7 (Mohs scale); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal (fibrous texture); 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 scale); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal (fibrous texture); Cleavage: None; Specific gravity: 2.64-2.71
Formation & geological history
Formed through a metamorphic process where quartz replaced existing crocidolite (blue asbestos) fibers while retaining the original fibrous structure. Most deposits are approximately 2 billion years old, typically found in banded iron formations.
Uses & applications
Predominantly used for lapidary work including cabochons, beads, jewelry, and ornamental carvings. It is also a popular stone for chakra healing and crystal collecting.
Geological facts
Tiger's Eye is a classic example of a pseudomorph (false form). It exhibits chatoyancy, an optical phenomenon where a band of reflected light moves across the stone, resembling a cat's eye. It was once considered more valuable than gold until large deposits were found in the 19th century.
Field identification & locations
Identify in the field by its distinct golden-yellow to brown bands and silky luster. It is most commonly found in the Griquatown West region of South Africa, Western Australia, and parts of India and Burma. Look for the 'shimmer' when the stone is rotated under a light source.
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