metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
Hardness: 7 (Mohs scale); Color: Golden to brown-yellow with chatoyant bands; Luster: Silky; Crystal structure: Trigonal (fibrous aggregate); Cleavage: None; Specific gravity: 2.64-2.71
- Hardness
- 7 (Mohs scale)
- Color
- Golden to brown-yellow with chatoyant bands
- Luster
- Silky
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 (Mohs scale); Color: Golden to brown-yellow with chatoyant bands; Luster: Silky; Crystal structure: Trigonal (fibrous aggregate); Cleavage: None; Specific gravity: 2.64-2.71
Formation & geological history
Formed through the pseudomorphism of blue asbestos (crocidolite) fibers by silica (quartz). Metamorphic processes replace the mineral while preserving the fibrous structure. Often found in Precambrian iron formations.
Uses & applications
Predominantly used as a gemstone in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock collectors and metaphysical use.
Geological facts
It is famous for its chatoyancy, or 'cat's eye' effect, caused by the reflection of light off the parallel mineral fibers. If the stone remains blue during formation, it is called Hawk's Eye.
Field identification & locations
Identify in the field by its distinct golden-yellow luster and 'moving' light band when tilted. Commonly found in South Africa, Western Australia, India, and Namibia. Collectors should look for vibrant banding and high polish.
More like this
