metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5–7 (Mohs scale); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific gravity: 2.64–2.71.

Hardness: 6
Color: Golden to red-brown
Luster: Silky

Identified March 15, 2026More metamorphic →

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Physical properties

Hardness: 6.5–7 (Mohs scale); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific gravity: 2.64–2.71.

Formation & geological history

Formed through the replacement of fibrous crocidolite (blue asbestos) with silica (quartz) while retaining the original fibrous structure. Most deposits are approximately 2 billion years old.

Uses & applications

Primarily used for lapidary purposes, jewelry (cabochons and beads), talismans, and ornamental carvings.

Geological facts

It exhibits a phenomenon called chatoyancy, which creates a 'cat's eye' effect as light reflects off the fibrous inclusions. It is considered a classic example of a pseudomorph.

Field identification & locations

Identify by its silky luster and band-like light reflection that shifts when the stone is rotated. Commonly found in South Africa, Australia, and Brazil. Collectors should look for sharp, distinct chatoyant bands.