metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
Hardness: 6.5–7 (Mohs). Color: Golden yellow to deep brown with silky luster. Structure: Hexagonal crystal system (trigonal) with fibrous texture. It exhibits chatoyancy (the cat-eye effect).
- Hardness
- 6
- Color
- Golden yellow to deep brown with silky luster
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5–7 (Mohs). Color: Golden yellow to deep brown with silky luster. Structure: Hexagonal crystal system (trigonal) with fibrous texture. It exhibits chatoyancy (the cat-eye effect).
Formation & geological history
Formed through a metamorphic process where quartz replaces the asbestos mineral crocidolite, retaining its fibrous structure. This alteration occurs under specific heat and pressure conditions over millions of years.
Uses & applications
Used primarily in jewelry (cabochons, beads), decorative carvings, and as a popular collector's stone. It is also historically used as an amulet for protection and luck.
Geological facts
Known as a 'pseudomorph' because the quartz minerals take the physical form of the pre-existing crocidolite fibers. When heated to high temperatures, it turns into 'Red Tiger's Eye.'
Field identification & locations
Identify by its characteristic chatoyancy—look for a band of light that moves across the surface as the stone is tilted. It is commonly found in South Africa, Western Australia, India, and Myanmar.
More like this
