metamorphic

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

Pseudomorph of Quartz after Crocidolite (SiO2)

AI-generated identification · may be incorrect

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

Hardness: 6
Luster: Silky

Identified April 23, 2026More metamorphic →

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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.