metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 Mohs; Color: Golden-brown to yellow with chatoyancy; Luster: Silky; Crystal system: Trigonal/Fibrous; Specific Gravity: 2.64-2.71
- Hardness
- 6
- Color
- Golden-brown to yellow with chatoyancy
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 Mohs; Color: Golden-brown to yellow with chatoyancy; Luster: Silky; Crystal system: Trigonal/Fibrous; Specific Gravity: 2.64-2.71
Formation & geological history
Formed through a process called pseudomorphism, where silica replaces existing crocidolite (asbestos) fibers while preserving the fibrous structure. It is typically found in metamorphic formations associated with iron-bearing sedimentary rocks.
Uses & applications
Used primarily in jewelry as cabochons, beads, and carvings. Also popular as a metaphysical/healing stone and for lapidary collections.
Geological facts
The characteristic shimmer is called chatoyancy, or the 'cat's eye' effect. If the iron in the stone is oxidized through heating, it turns red (Red Tiger's Eye). If the material is not fully oxidized, it remains blue (Hawk's Eye).
Field identification & locations
Identify by its distinct golden-brown bands and the way the reflective light moves across its surface when tilted. Major deposits are found in South Africa, Australia, and Namibia.
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