metamorphic

Tiger's Eye

Silicon Dioxide (SiO2) replacing Crocidolite

AI-generated identification · may be incorrect

Hardness: 7 on the Mohs scale. Color: Golden-yellow to red-brown, displaying strong chatoyancy (cat's-eye effect). Luster: Silky. Crystal Structure: Trigonal (microcrystalline quartz). Cleavage: None. Specific Gravity: 2.64-2.71.

Hardness: 7 on the Mohs scale
Luster: Silky

Identified July 23, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed as a pseudomorph when quartz replaces fibrous blue crocidolite (asbestos) through hydrothermal processes, leaving the fibrous structure intact which gives it chatoyancy, stained golden-yellow by limonite or iron oxides.

Uses & applications

Popular gemstone used in lapidary work, cabochons, beads, jewelry, carved figurines, and decorative ornamental items. Also popular with rock collectors.

Geological facts

Tiger's Eye demonstrates a unique phenomenon called chatoyancy, where light reflects off the fibrous parallel inclusion layers, mimicking a cat's eye or tiger's eye. Related stones include Hawk's Eye (blue) and Pietersite.

Field identification & locations

Identified by its distinctive silky, golden-brown silky luster and optical chatoyant bands that shift light when turned. Major sources include South Africa, Australia, India, Brazil, and the USA (California).