gemstone
Tiger's Eye
Silicon dioxide (Quartz pseudomorph after crocidolite), SiO2
Hardness: 7 on the Mohs scale; Color: Golden-yellow, brown, reddish-brown; Luster: Silky to vitreous; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.71
- Hardness
- 7 on the Mohs scale
- Color
- Golden-yellow, brown, reddish-brown
- Luster
- Silky to vitreous
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Physical properties
Hardness: 7 on the Mohs scale; Color: Golden-yellow, brown, reddish-brown; Luster: Silky to vitreous; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.71
Formation & geological history
Formed when quartz chemically replaces the fibrous mineral crocidolite (blue asbestos) while retaining its fibrous structure, creating chatoyancy. This pseudomorphic replacement occurs in low-temperature hydrothermal veins and sedimentary deposits.
Uses & applications
Widely used in jewelry, cabochons, beads, ornamental carvings, and as a popular specimen for rock collectors.
Geological facts
Tiger's eye exhibits a distinctive cat's-eye effect (chatoyancy) caused by the parallel arrangement of quartz fibers reflecting light. Historically, it was used as a protective amulet against curses and ill wishes by ancient civilizations.
Field identification & locations
Easily identified by its golden-brown color and characteristic silky band of light that moves across the surface when turned. Major deposits are found in South Africa, Western Australia, the USA, Canada, and India.
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