Mineral

Tiger's Eye

SiO2 (Silicon Dioxide with iron inclusions)

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

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

Identified April 17, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through a pseudomorphic process where silica replaces the fibrous mineral crocidolite (blue asbestos) while retaining the fibrous structure. Primarily found in metamorphosed iron formations.

Uses & applications

Mainly used as a gemstone for jewelry (beads, cabochons), ornamental carvings, and as a popular specimen for collectors due to its unique optical properties.

Geological facts

Exhibits a unique optical effect known as 'chatoyancy' or the 'cat's-eye effect,' where a band of reflected light moves across the surface as the stone is rotated under a light source.

Field identification & locations

Identify in the field by its distinct golden-brown color, fibrous texture, and shimmering chatoyancy. It is common in South Africa, Australia, India, and the USA. Collectors look for high polish and strong light banding.

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Mineral/Rock

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