Tiger's Eye (likely variant or dark tumble)

Physical Properties

Hardness: 6.5-7.0 (Mohs scale), Color: Golden brown to dark reddish-black, Luster: Silky/Vitreous, Structure: Trigonal (fibrous texture), Specific Gravity: 2.64-2.71

Formation & Geological History

Formed through the replacement of fibrous crocidolite (asbestos) by silica. The fibers are preserved in a parallel orientation, creating its signature chatoyancy.

Uses & Applications

Predominantly used for lapidary work, jewelry making (cabochons), ornamental carvings, and as a popular palm stone for collectors.

Geological Facts

Tiger's Eye is known for a phenomenon called chatoyancy (the cat's-eye effect). If it has been heat-treated, it turns red (Red Tiger's Eye), and if naturally occurring in blue, it is called Hawk's Eye.

Field Identification & Locations

Identify by its shifting bands of light when tilted (chatoyancy). It is commonly found in large deposits in South Africa, Australia, and Brazil. Collectors should look for smooth, consistent banding and high luster when polished.

Identified on: 4/18/2026

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