metamorphic
Tiger's Eye
Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs); Color: Golden to red-brown; Luster: Silky; Crystal Structure: Trigonal (fibrous texture); Cleavage: None; Specific Gravity: 2.64-2.71
- Hardness
- 6
- Color
- Golden to red-brown
- Luster
- Silky
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; Luster: Silky; Crystal Structure: Trigonal (fibrous texture); Cleavage: None; Specific Gravity: 2.64-2.71
Formation & geological history
Formed when quartz replaces fibrous crocidolite (blue asbestos) via pseudomorphism. It maintains the fibrous structure but is chemically quartz. Primarily found in iron formations.
Uses & applications
Predominantly used for jewelry (cabochons, beads), decorative carvings, and as a popular collector's gemstone due to its chatoyancy.
Geological facts
The distinct shimmering effect is called 'chatoyancy' or the 'cat-eye effect.' It is often heat-treated to produce Red Tiger's Eye.
Field identification & locations
Identify by its golden-brown bands and the 'moving' light effect when rotated. Major deposits are located in South Africa and Western Australia.
More like this
Other metamorphic specimens
Nephrite Jade
Nephrite
Mineral/Rock
Amphibolite
Amphibolite
metamorphic
Rhodonite
Manganese Silicate (Mn, Fe, Mg, Ca)SiO3
mineral
Rhodonite
(Mn,Fe,Mg,Ca)SiO3
mineral
Greenschist
Greenschist (containing Chlorite, Actinolite, and Epidote)
metamorphic
Garnet
Garnet group: X3Y2(SiO4)3 (commonly Almandine-Pyrope series)
mineral