metamorphic
Tiger's Eye (Raw)
Silicon Dioxide (SiO2) with fibrous crocidolite inclusions
Hardness: 6.5-7 (Mohs). Color: Golden brown to reddish-brown. Luster: Silky to dull when raw, chatoyant when polished. Crystal structure: Trigonal (fibrous). Cleavage: None. Specific Gravity: 2.64-2.71.
- Hardness
- 6
- Color
- Golden brown to reddish-brown
- Luster
- Silky to dull when raw, chatoyant when polished
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Physical properties
Hardness: 6.5-7 (Mohs). Color: Golden brown to reddish-brown. Luster: Silky to dull when raw, chatoyant when polished. Crystal structure: Trigonal (fibrous). Cleavage: None. Specific Gravity: 2.64-2.71.
Formation & geological history
Formed through the pseudomorphism of crocidolite (blue asbestos) by quartz. As quartz replaces the fibers, iron is oxidized to create the golden-brown color. Most deposits are Proterozoic in age.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons), ornamental carvings, and widely collected as metaphysical or decorative specimens.
Geological facts
Tiger's Eye is a classic example of chatoyancy, the 'cat-eye' effect. It is a pseudomorph, meaning one mineral has replaced another while retaining the original mineral's shape (the fibers).
Field identification & locations
Identify in the field by its distinct fibrous, banded appearance and golden-brown stripes. Commonly found in South Africa, Western Australia, and Namibia. Collectors should look for chatoyancy even in rough surfaces.
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