metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
Hardness: 7.0 (Mohs); Color: Golden yellow to brown with chatoyant stripes; Luster: Silky; Crystal structure: Trigonal (fibrous texture); Cleavage: None; Specific Gravity: 2.64-2.71
- Hardness
- 7
- Color
- Golden yellow to brown with chatoyant stripes
- Luster
- Silky
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Physical properties
Hardness: 7.0 (Mohs); Color: Golden yellow to brown with chatoyant stripes; Luster: Silky; Crystal structure: Trigonal (fibrous texture); Cleavage: None; Specific Gravity: 2.64-2.71
Formation & geological history
Formed when quartz replaces fibrous crocidolite (blue asbestos) via a process of pseudomorphism, preserving the original fibrous structure. Found in iron formations and tectonic metamorphic environments.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, ornaments, and as a popular semi-precious stone for collectors.
Geological facts
The shimmering effect, known as chatoyancy, is caused by light reflecting off the internal fibers. It was historically worn by Roman soldiers in battle for protection and courage.
Field identification & locations
Identify by its distinctive silky luster and golden bands that appear to move when the stone is tilted. Common locations include South Africa, Australia, India, and the USA.
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