
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7.0 (Mohs scale), Color: Golden to red-brown variants, Luster: Silky to vitreous, Crystal Structure: Trigonal/Fibrous, Cleavage: None, Specific Gravity: 2.64-2.71
- Hardness
- 6
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7.0 (Mohs scale), Color: Golden to red-brown variants, Luster: Silky to vitreous, Crystal Structure: Trigonal/Fibrous, Cleavage: None, Specific Gravity: 2.64-2.71
Formation & geological history
Formed through the replacement of fibrous blue crocidolite asbestos by silica (chalcedony/quartz). This process creates a pseudomorph where the fibrous structure is preserved within the stone. Most specimens originate from Precambrian Iron formations.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular semi-precious spiritual or collector's gemstone.
Geological facts
It exhibits a unique optical effect known as chatoyancy (cat's eye effect) caused by light reflecting off the internal fibers. It is often believed in folklore to provide protection and courage to the wearer.
Field identification & locations
Identify by its distinct golden-yellow bands and the way light seems to move across the surface when tilted. Major deposits are found in South Africa, Western Australia, India, and Namibia.
More like this