metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 (Mohs); Color: Golden to red-brown; Luster: Silky; Structure: Trigonal (fibrous); Chatoyant (cat's-eye effect); 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; Structure: Trigonal (fibrous); Chatoyant (cat's-eye effect); 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 mineral's fibrous shape is preserved but replaced by silica.
Uses & applications
Primarily used in jewelry for cabochons and beads, as well as for decorative carvings, palm stones, and metaphysical collections.
Geological facts
The optical effect called chatoyancy is caused by reflections from the mineral's parallel fibrous structure. It is believed by some cultures to provide protection and insight to the wearer.
Field identification & locations
Identify by the distinct 'moving' golden bands when rotated under light. Commonly found in South Africa, Australia, Burma, and India. Look for a silky luster and parallel banding.
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