metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
Hardness: 6.5–7 (Mohs scale); Color: Golden to red-brown with silky luster; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific Gravity: 2.64–2.71; Chatoyancy: Distinctive 'cat-eye' optical effect.
- Hardness
- 6
- Color
- Golden to red-brown with silky luster
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Physical properties
Hardness: 6.5–7 (Mohs scale); Color: Golden to red-brown with silky luster; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific Gravity: 2.64–2.71; Chatoyancy: Distinctive 'cat-eye' optical effect.
Formation & geological history
Formed through a metamorphic process where quartz replaces the mineral crocidolite (blue asbestos) while preserving its fibrous structure, often found in Precambrian metamorphic rocks.
Uses & applications
Primarily used in jewelry for cabochons and beads, as well as carvings, decorative ornaments, and widely collected as a metaphysical or healing stone.
Geological facts
This stone is a 'pseudomorph,' meaning 'false form.' It started as a blue mineral (crocidolite) but was completely replaced by silica over millions of years while keeping the original fibers intact.
Field identification & locations
Identify by rotating it under light to see the shimmering bands move (chatoyancy). Commonly found in South Africa, Western Australia, and India. Collectors should look for high-contrast bands and a high polish.
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