Tiger's Eye

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.

Identified on: 4/17/2026

Mode: Standard