metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
Hardness: 6.5–7 on Mohs scale; Color: Golden-brown to reddish-brown; Luster: Silky to vitreous; Crystal structure: Hexagonal (trigonal); Cleavage: None; Specific gravity: 2.64–2.71; Notable for chatoyancy (cat's-eye effect).
- Hardness
- 6
- Color
- Golden-brown to reddish-brown
- Luster
- Silky to vitreous
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Golden-brown to reddish-brown; Luster: Silky to vitreous; Crystal structure: Hexagonal (trigonal); Cleavage: None; Specific gravity: 2.64–2.71; Notable for chatoyancy (cat's-eye effect).
Formation & geological history
Formed when quartz replaces the fibrous mineral crocidolite (blue asbestos) through a process of pseudomorphism. It often occurs in metamorphic iron formations, with major deposits found in the Northern Cape Province of South Africa.
Uses & applications
Primary use is in jewelry (cabochons, beads) and ornamental carvings. It is also a popular stone for lapidary collectors and used in decorative interior accents.
Geological facts
The unique 'shimmer' is caused by the parallel arrangement of quartz fibers and altered amphibole fibers. Historically, it was worn by Roman soldiers in battle for protection and remains one of the most popular 'balancing' stones in metaphysical belief systems.
Field identification & locations
Identify in the field by its distinctive 'moving' light bands (chatoyancy) when rotated. Found in high concentrations in South Africa, Western Australia, USA, and India. It is durable and relatively easy to polish.
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