metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
Hardness: 7 Mohs; Color: Golden yellow to reddish-brown; Luster: Silky; Crystal structure: Hexagonal (trigonal); Cleavage: None; Specific Gravity: 2.64-2.71. Displays chatoyancy (cat's eye effect).
- Hardness
- 7 Mohs
- Color
- Golden yellow to reddish-brown
- Luster
- Silky
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Physical properties
Hardness: 7 Mohs; Color: Golden yellow to reddish-brown; Luster: Silky; Crystal structure: Hexagonal (trigonal); Cleavage: None; Specific Gravity: 2.64-2.71. Displays chatoyancy (cat's eye effect).
Formation & geological history
Formed as a pseudomorph through the alteration of crocidolite (blue asbestos) fiber veins into silicon dioxide. Most deposits date back to the Precambrian era (over 2 billion years old) in iron-rich hydrothermal environments.
Uses & applications
Used primarily in lapidary work for jewelry (cabochons, beads), decorative carvings, and as a popular meditation or 'healing' stone in metaphysical communities.
Geological facts
It is famous for its chatoyant effect where the bands look like they move as the stone is turned. It is the anniversary gemstone for the 9th year of marriage and was historically worn by Roman soldiers for protection in battle.
Field identification & locations
Identify by its golden-brown parallel fiber bands and the 'moving' optical effect when rotated. Primarily found in South Africa (Northern Cape), Australia, Myanmar, and Namibia. Collectors look for high polish and sharp color contrast.
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