metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
Hardness: 6.5-7.0 (Mohs scale); Color: Golden yellow, brown, and honey; Luster: Silky; Crystal structure: Trigonal (fibrous texture); Cleavage: None; Specific gravity: 2.64-2.71.
- Hardness
- 6
- Color
- Golden yellow, brown, and honey
- Luster
- Silky
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Physical properties
Hardness: 6.5-7.0 (Mohs scale); Color: Golden yellow, brown, and honey; Luster: Silky; Crystal structure: Trigonal (fibrous texture); Cleavage: None; Specific gravity: 2.64-2.71.
Formation & geological history
Formed through the metamorphic process of pseudomorphism, where quartz replaces the fibrous mineral crocidolite (blue asbestos) while retaining its structure, usually in banded iron formations dating back over 2 billion years.
Uses & applications
Extensively used in jewelry (cabochons, beads), decorative carvings, and as a popular grounding stone for crystal collectors.
Geological facts
Exhibits a unique optical effect known as chatoyancy (cat-eye effect) caused by the parallel reflection of light off the internal fibrous structure. South Africa and Western Australia host the world's most significant deposits.
Field identification & locations
Identify in the field by its distinctive 'moving' bands of light when tilted. It is commonly found in proximity to jasper and hematite in desert regions of South Africa, Australia, and Namibia.
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