metamorphic
Tiger's Eye (specifically Blue/Golden mixed or Hawk's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5–7 (Mohs scale); Color: Golden yellow, brown, and blue-gray; Luster: Silky; Crystal system: Trigonal (fibrous structure); Specific Gravity: 2.64–2.71; Cleavage: None.
- Hardness
- 6
- Color
- Golden yellow, brown, and blue-gray
- Luster
- Silky
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Physical properties
Hardness: 6.5–7 (Mohs scale); Color: Golden yellow, brown, and blue-gray; Luster: Silky; Crystal system: Trigonal (fibrous structure); Specific Gravity: 2.64–2.71; Cleavage: None.
Formation & geological history
Formed through the pseudomorphism of crocidolite (blue asbestos) fiber by silica. As minerals are replaced, the fibrous structure remains, creating the chatoyant effect. It is primarily found in metamorphic environments involving iron-rich formations.
Uses & applications
Used extensively in jewelry (cabs, beads), crystal healing, decorative carvings, and as a popular collector's specimen.
Geological facts
The optical phenomenon 'chatoyancy' (the cat's eye effect) is caused by light reflecting off the internal fibrous structure. Blue tiger's eye is often called 'Hawk's Eye'.
Field identification & locations
Identify in the field by its distinctive silky luster and moving bands of light (chatoyancy). It is commonly found in South Africa, Australia, Burma, India, and the United States.
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