mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 7 (Mohs scale); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal (fibrous); Cleavage: None; Specific gravity: 2.64-2.71.
- Hardness
- 7 (Mohs scale)
- Color
- Golden to red-brown
- Luster
- Silky
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Physical properties
Hardness: 7 (Mohs scale); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal (fibrous); Cleavage: None; Specific gravity: 2.64-2.71.
Formation & geological history
Formed when quartz replaces fibrous crocidolite (blue asbestos) through a process of pseudomorphism, typically found in iron-rich metamorphic rocks formed millions of years ago in Precambrian formations.
Uses & applications
Predominantly used as a gemstone in jewelry, beads, cabochons, and decorative carvings. Highly valued in lapidary arts for its chatoyancy.
Geological facts
Tiger's eye is a 'chatoyant' gemstone, meaning it reflects light like a cat's eye. It is considered a metamorphic rock by some but is technically a mineral variety of quartz.
Field identification & locations
Identify by its golden-brown bands and distinct 'sheen' or silky luster when moved in light. Commonly found in South Africa, Western Australia, and Namibia.
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