metamorphic
Blue Tiger's Eye (Hawks Eye)
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 (Mohs), Color: Blue to blue-gray, Luster: Silky to vitreous, Crystal structure: Trigonal (fibrous), Chatoyant effect, Specific gravity: 2.6-2.7
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Blue to blue-gray, Luster: Silky to vitreous, Crystal structure: Trigonal (fibrous), Chatoyant effect, Specific gravity: 2.6-2.7
Formation & geological history
Formed when silica-rich fluids replace the fibrous mineral crocidolite (asbestos) in iron-rich metamorphic rocks, retaining the fibrous structure without the health risk.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and in metaphysical practices.
Geological facts
Unlike golden tiger's eye, which has been oxidized by iron, blue tiger's eye retains much of the original coloring of the crocidolite fibers. It is known for its intense chatoyancy.
Field identification & locations
Identify by its blue silky sheen that moves with the light (chatoyancy). It is commonly found in South Africa, Western Australia, and parts of India and Brazil.
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