Tiger's Eye

Physical Properties

Hardness: 6.5-7.0 (Mohs scale); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific gravity: 2.64-2.71; Notable chatoyancy (cat's eye effect).

Formation & Geological History

Formed when quartz replaces the fibrous mineral crocidolite (blue asbestos) through a process called pseudomorphism. As long fibers of silica are deposited, iron oxidation creates the yellow-gold hues. Most deposits are found in Precambrian metamorphic formations.

Uses & Applications

Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular collector's specimen due to its unique optical properties.

Geological Facts

Tiger's eye is a classic example of chatoyancy. Its related varieties include 'Hawk's Eye' (blue, incomplete oxidation) and 'Bull's Eye' (red, often heat-treated). Traditionally, it was worn as an amulet against curses and ill-wishing.

Field Identification & Locations

Identify in the field by its distinct golden-brown fibrous bands that appear to move when the stone is rotated under a light source. Commonly found in South Africa, Australia, Burma, and India. Collectors should look for high-contrast banding and 'shimmer'.

Identified on: 4/29/2026

Mode: Standard