metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with Limonite inclusions)
Hardness: 6.5-7.0 (Mohs scale), Color: golden to red-brown, Luster: silky, Crystal structure: Trigonal (fibrous texture), specific gravity: 2.64-2.71. Displays strong chatoyancy.
- Hardness
- 6
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Physical properties
Hardness: 6.5-7.0 (Mohs scale), Color: golden to red-brown, Luster: silky, Crystal structure: Trigonal (fibrous texture), specific gravity: 2.64-2.71. Displays strong chatoyancy.
Formation & geological history
Formed when the fibrous mineral crocidolite (blue asbestos) is replaced by silica (quartz) while retaining its fibrous structure, often associated with banded iron formations. Most deposits are approximately 2 billion years old.
Uses & applications
Extensively used in jewelry (beads, cabochons), ornamental carvings, and as a popular chakara or healing stone in metaphysical communities.
Geological facts
Tiger's Eye is a classic example of a pseudomorph; it is also a chatoyant gemstone that produces a 'cat's eye' effect when light reflects off the fibrous inclusions.
Field identification & locations
Identified by its distinctive golden-brown bands and silky, moving light effect (chatoyancy). Primary source is the Northern Cape Province in South Africa and the Pilbara region of Australia.
