metamorphic
Blue Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 Mohs; Color: Dark blue to blue-gray; Luster: Silky; Crystal system: Trigonal/Fibrous; Chatoyancy (cat-eye effect); Specific Gravity: 2.58-2.66
- Hardness
- 6
- Color
- Dark blue to blue-gray
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 Mohs; Color: Dark blue to blue-gray; Luster: Silky; Crystal system: Trigonal/Fibrous; Chatoyancy (cat-eye effect); Specific Gravity: 2.58-2.66
Formation & geological history
Formed through a process called pseudomorphism, where quartz replaces the fibrous mineral crocidolite (blue asbestos) over millions of years. This specimen specifically is the 'un-oxidized' version of traditional gold Tiger's Eye.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a metaphysical healing stone for grounding and focus.
Geological facts
Also known as 'Hawk's Eye', it is a chatoyant gemstone that appears to move as the light hits the fibers. Unlike the gold version, it has not yet been subjected to the iron oxidation that changes the color to brown/yellow.
Field identification & locations
Identify by rotating under a light source to see the silky 'shimmer' or chatoyant bands. Common locations include South Africa, Australia, and Namibia.
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