mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 7 Mohs; Color: Golden-brown to yellow with chatoyancy; Luster: Silky; Crystal Structure: Hexagonal/Trigonal; Cleavage: None; Specific Gravity: 2.64-2.71
- Hardness
- 7 Mohs
- Color
- Golden-brown to yellow with chatoyancy
- Luster
- Silky
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Physical properties
Hardness: 7 Mohs; Color: Golden-brown to yellow with chatoyancy; Luster: Silky; Crystal Structure: Hexagonal/Trigonal; Cleavage: None; Specific Gravity: 2.64-2.71
Formation & geological history
Formed when quartz replaces parallel fibers of crocidolite asbestos through a process called pseudomorphism, primarily in metamorphic environments. Large deposits are found in Precambrian iron formations.
Uses & applications
Polished for use in jewelry (cabochons, beads), decorative carvings, and as a popular pocket stone for collectors.
Geological facts
The shimmering effect is called chatoyancy (cat's eye effect), caused by the orientation of the underlying fibers. It is often found associated with Tiger's Iron, which includes hematite and jasper.
Field identification & locations
Identify by its distinctive silky luster and bandas of light that move across the surface when it is rotated. Most commonly sourced from South Africa and Australia.
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