metamorphic
Tiger's Eye (Gold/Brown variety)
Silicon dioxide (SiO2) with fibrous crocidolite inclusions
Hardness: 6.5–7 (Mohs); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal (rhombohedral); 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 (rhombohedral); Cleavage: None; Specific Gravity: 2.64–2.71
Formation & geological history
Formed when quartz replaces fibrous crocidolite (blue asbestos) through a process of pseudomorphism, where the original fibrous shape is preserved but replaced by silica. Commonly found in Precambrian iron formations.
Uses & applications
Predominantly used for lapidary work, jewelry (cabochons, beads), decorative carvings, and as a popular collector's gemstone for its unique shimmer.
Geological facts
Exhibits chatoyancy, the 'cat-eye' effect, which occurs because the light reflects off the fibrous parallel structure. It is the birthstone for Gemini and is traditionally associated with focus and protection.
Field identification & locations
Identify by its distinct golden stripes and 'optical move' when rotated under a light source. Found primarily in South Africa (Griqua Town), Australia, India, and Namibia.
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