mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 Mohs; Color: Golden-brown to yellow with dark stripes; Luster: Silky; Structure: Trigonal/Fibrous; Chatoyancy: High; Specific Gravity: 2.64-2.71
- Hardness
- 6
- Color
- Golden-brown to yellow with dark stripes
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 Mohs; Color: Golden-brown to yellow with dark stripes; Luster: Silky; Structure: Trigonal/Fibrous; Chatoyancy: High; Specific Gravity: 2.64-2.71
Formation & geological history
Formed via the replacement of blue asbestos (crocidolite) fibers with translucent quartz through a process called pseudomorphism, resulting in chatoyant bands. Typically found in metamorphosed iron formations.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collector's stone.
Geological facts
The optical effect is called chatoyancy (cat-eye effect). Historically used as a protective amulet against curses and ill-wishing. It is the anniversary gemstone for the 9th year of marriage.
Field identification & locations
Identified by its distinctive golden-brown bands and silky luster that 'shifts' under light. Most commonly sourced from South Africa and Western Australia. Collectors look for sharp, clean bands.
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