metamorphic
Tiger's Eye
SiO2 (Silicon Dioxide)
Hardness: 7 on Mohs scale; Color: golden yellow to honey brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; Specific Gravity: 2.64-2.71; Chatoyancy (cat's eye effect).
- Hardness
- 7 on Mohs scale
- Color
- golden yellow to honey brown
- Luster
- Silky
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Physical properties
Hardness: 7 on Mohs scale; Color: golden yellow to honey brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; Specific Gravity: 2.64-2.71; Chatoyancy (cat's eye effect).
Formation & geological history
Formed by the pseudomorphism of crocidolite (asbestos) quartz. The original fibers are replaced by silica while maintaining their fibrous structure, often occurring in iron-rich sedimentary formations.
Uses & applications
Primarily used in jewelry for cabochons and beads, ornamental carvings, and as a popular collector's gemstone due to its unique optical effects.
Geological facts
The unique chatoyancy is caused by the reflection of light off parallel mineral fibers within the quartz. It is thought to be a protective stone in various cultures.
Field identification & locations
Identify in the field by its distinct golden-yellow bands and the shifting silken luster when rotated in light. Significant deposits are found in South Africa, Australia, and India.
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