metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
Hardness: 6.5–7 on the Mohs scale; Color: Golden-yellow to deep brown; Luster: Silky; Crystal structure: Trigonal (fibrous aggregate); Cleavage: None; Specific gravity: 2.64–2.71.
- Hardness
- 6
- Color
- Golden-yellow to deep brown
- Luster
- Silky
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Physical properties
Hardness: 6.5–7 on the Mohs scale; Color: Golden-yellow to deep brown; Luster: Silky; Crystal structure: Trigonal (fibrous aggregate); Cleavage: None; Specific gravity: 2.64–2.71.
Formation & geological history
Formed through a metamorphic process where quartz replaced the blue asbestos mineral crocidolite through pseudomorphism. Iron oxides (limonite) provide the characteristic gold/brown color. Primarily found in Precambrian rock formations over 2 billion years old.
Uses & applications
Predominantly used for jewelry (cabochons, beads), decorative carvings, and as a popular gemstone for rock collectors and metaphysical practitioners.
Geological facts
Tiger's Eye exhibits a unique optical property called chatoyancy, or the 'cat-eye effect.' When turned in light, the fibers create a shimmering band of light that seems to glide across the surface. It was once considered more valuable than gold in the early 19th century.
Field identification & locations
Identify in the field by its distinct golden-brown fibrous bands and high silky luster when polished. It is mostly found in South Africa (Griqualand West), but also occurs in Western Australia, India, and Namibia.
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