metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 7 on Mohs scale; Color: golden-brown to yellow with dark bands; Luster: silky or vitreous; Crystal system: trigonal/fibrous; Features distinct chatoyancy (cat's-eye effect).
- Hardness
- 7 on Mohs scale
- Color
- golden-brown to yellow with dark bands
- Luster
- silky or vitreous
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 on Mohs scale; Color: golden-brown to yellow with dark bands; Luster: silky or vitreous; Crystal system: trigonal/fibrous; Features distinct chatoyancy (cat's-eye effect).
Formation & geological history
Formed through a process called pseudomorphism, where quartz replaces the asbestos mineral crocidolite while retaining its original fibrous structure. Primarily found in metamorphosed iron formations.
Uses & applications
Extensively used in jewelry (cabochons, beads), decorative carvings, meditation stones, and as a popular collectible lapidary material.
Geological facts
The chatoyant effect is caused by the reflection of light off the parallel mineral fibers within the stone. In its natural blue state before oxidation turns it brown, it is known as Hawk's Eye.
Field identification & locations
Identify by rotating the stone under light to observe the shifting gold bands. Found primarily in South Africa and Western Australia. It is a traditional protective stone in many cultures.
More like this
