metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxides)
Hardness: 6.5-7; Color: Golden yellow to deep brownish-red with distinct chatoyant bands; Luster: Silky; Crystal structure: Trigonal; Fracture: Fibrous
- Hardness
- 6
- 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; Color: Golden yellow to deep brownish-red with distinct chatoyant bands; Luster: Silky; Crystal structure: Trigonal; Fracture: Fibrous
Formation & geological history
Formed when quartz replaces fibrous crocidolite (asbestos) through a process of pseudomorphism, retaining the original fibrous structure. Most deposits are Proterozoic in age.
Uses & applications
Predominantly used as a semi-precious gemstone in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for collectors.
Geological facts
The chatoyancy (cat's eye effect) is caused by the parallel reflection of light off the internal fibrous structure. It is often associated with the 'Solar Plexus' chakra in metaphysical traditions.
Field identification & locations
Look for a distinct 'shimmer' or moving band of light when rotating the stone under a light source. Commonly found in South Africa, Western Australia, India, and Myanmar.
More like this
