Mineral / Metamorphic
Tiger's Eye (Rough)
SiO2 (Silicon Dioxide / Pseudomorph of Quartz after Crocidolite)
Hardness: 7 on Mohs scale; Color: Golden to brown with chatoyant yellow bands; Luster: Silky; Crystal System: Trigonal; Cleavage: None; Specific Gravity: 2.64-2.71.
- Hardness
- 7 on Mohs scale
- Color
- Golden to brown with chatoyant yellow bands
- Luster
- Silky
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Physical properties
Hardness: 7 on Mohs scale; Color: Golden to brown with chatoyant yellow bands; Luster: Silky; Crystal System: Trigonal; Cleavage: None; Specific Gravity: 2.64-2.71.
Formation & geological history
Formed when quartz replaces the blue crocidolite (asbestos) fibers through a process called pseudomorphism, while retaining the fibrous structure. Primarily found in Precambrian iron formations (approx. 2 billion years old).
Uses & applications
Predominantly used for lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a popular specimen for crystal collectors and 'metaphysical' retail.
Geological facts
The characteristic 'cat's eye' effect is called chatoyancy. When the fibers remain blue rather than turning brown/gold through oxidation, the mineral is known as 'Hawk's Eye'.
Field identification & locations
Identify in the field by its distinctive silky luster and alternating dark/light bands that shift as the stone is rotated under light. Most commonly found in the Griqualand West region of South Africa and the Pilbara region of Australia.
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