Metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)
Hardness: 6.5-7 (Mohs); Color: Golden to red-brown with silky luster; Crystal system: Trigonal/Fibrous; No cleavage; Specific gravity: 2.64-2.71; Notable for chatoyancy (cat's eye effect).
- Hardness
- 6
- Color
- Golden to red-brown with silky luster
Identified More metamorphic →
Explore Tiger's Eye in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 (Mohs); Color: Golden to red-brown with silky luster; Crystal system: Trigonal/Fibrous; No cleavage; Specific gravity: 2.64-2.71; Notable for chatoyancy (cat's eye effect).
Formation & geological history
Formed through the pseudomorphism of crocidolite (asbestos). Over time, quartz replaces the asbestos fibers while retaining the original fibrous structure. The golden color comes from oxidized iron. Most deposits are billions of years old.
Uses & applications
Predominantly used as a gemstone in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for collectors and metaphysical enthusiasts.
Geological facts
The unique 'shimmer' of Tiger's Eye is called chatoyancy. If the iron is not oxidized and remains blue, the stone is called 'Hawk's Eye'. It is the 9th wedding anniversary stone.
Field identification & locations
Identify by its distinct golden-brown banding and the way light reflects off the fibrous inclusions when tilted. It is most commonly found in South Africa and Western Australia.
More like this
