metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7.0 (Mohs scale); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific Gravity: 2.64-2.71; Notable for its chatoyancy.
- Hardness
- 6
- Color
- Golden to red-brown
- Luster
- Silky
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Physical properties
Hardness: 6.5-7.0 (Mohs scale); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific Gravity: 2.64-2.71; Notable for its chatoyancy.
Formation & geological history
Formed through the pseudomorphism of blue crocidolite (asbestos) fibers by silica (quartz). Over geological time, iron replaces the original mineral, creating the golden streaks. Primarily found in Precambrian iron formations.
Uses & applications
Extensively used in jewelry making (beads, cabochons, pendants), ornamental carvings, and as a popular semi-precious stone for mineral collectors and practitioners of crystal healing.
Geological facts
It is a fibrous variety of quartz that exhibits chatoyancy, an optical effect where light reflects off the parallel fibers to create a moving band of light. If the crocidolite doesn't oxidize, it remains blue and is called Hawk's Eye.
Field identification & locations
Identify in the field by its distinct silky luster and the 'cat-eye' effect when rotated under light. Major deposits are located in South Africa (Griualand West), Australia, India, and Namibia.
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