metamorphic
Tiger's Eye
SiO2 (Pseudomorph of Quartz after Crocidolite)
Hardness: 6.5-7 (Mohs); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific Gravity: 2.64-2.71.
- Hardness
- 6
- Color
- Golden to red-brown
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific Gravity: 2.64-2.71.
Formation & geological history
Formed when quartz replaces parallel fibers of crocidolite asbestos through a process called pseudomorphism. It is often found in metamorphosed iron formations, typically associated with Precambrian geological eras.
Uses & applications
Primary use is in jewelry (cabochons, beads) and ornamental carvings due to its chatoyancy. Also a popular collector's mineral and used in metaphysical practices.
Geological facts
The 'cat's eye' effect, known as chatoyancy, is caused by the reflection of light off the fibrous structure of the mineral. If the specimen's iron content is lower, it can appear blue, known as Hawk's Eye.
Field identification & locations
Identify by its unique silky banding and chatoyant 'shimmer' when rotated under light. Common locations include South Africa (Northern Cape), Western Australia, India, and Namibia.
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