mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 (Mohs); Color: Golden to red-brown; Luster: Silky; Structure: Hexagonal (trigonal); Features strong chatoyancy (cat's eye effect).
- Hardness
- 6
- Color
- Golden to red-brown
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Golden to red-brown; Luster: Silky; Structure: Hexagonal (trigonal); Features strong chatoyancy (cat's eye effect).
Formation & geological history
Formed through a process called pseudomorphism, where silica replaces the mineral crocidolite (asbestos) while maintaining its fibrous structure. It is commonly associated with metamorphic rocks.
Uses & applications
Primarily used in jewelry for rings, beads, and pendants, and as an ornamental stone for carvings and decorative objects.
Geological facts
The 'cat's eye' effect is caused by the parallel orientation of the quartz fibers and the presence of iron oxides. Historically, it was worn as a protective amulet against curses and bad luck.
Field identification & locations
Identified by its distinctive golden-brown bands and silky luster that seems to move when tilted in light. Major sources include South Africa, Australia, Burma, and India.
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