Tiger's Eye (likely Hawk's Eye variant)

Physical Properties

Hardness: 6.5-7 (Mohs); Color: Blue-grey to greenish-black (Hawk's eye) with golden-brown bands; Luster: Silky; Crystal structure: Trigonal; Cleavage: None; Specific gravity: 2.64-2.71

Formation & Geological History

Formed through a metamorphic process where quartz replaces crocidolite (asbestos) fibers while retaining the original fibrous structure (pseudomorphism). Most deposits are found in Precambrian rock formations over 2 billion years old.

Uses & Applications

Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock collectors and metaphysical use.

Geological Facts

It exhibits chatoyancy, an optical effect that makes it look like a cat's eye when light reflects off the fibrous inclusions. When the specimen shifts toward blue/grey, it is often called 'Hawk's Eye'.

Field Identification & Locations

Identify in the field by its characteristic silky luster and 'moving' light bands (chatoyancy) when rotated. It is commonly found in South Africa, Australia, and Brazil.

Identified on: 4/23/2026

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