Tiger's Eye

Physical Properties

Hardness: 7 on Mohs scale; Color: Golden-yellow to brown; Luster: Silky; Crystal structure: Trigonal; Cleavage: None; Specific gravity: 2.64-2.71

Formation & Geological History

Formed as a pseudomorph of quartz after the fibrous mineral crocidolite. It is primarily found in metamorphic environments involving iron-rich formations. Most deposits are significant in age, often dating to the Precambrian.

Uses & Applications

Predominantly used in jewelry (beads, cabochons), ornamental carvings, and as a popular semi-precious gemstone for collectors.

Geological Facts

Tiger's Eye displays a unique optical effect known as chatoyancy, where light reflects off the fibrous inclusions to create a band of light that resembles a cat's eye. It is the planetary stone for Gemini and the chalcedony variety for the 9th wedding anniversary.

Field Identification & Locations

Identify in the field by its distinctive silky luster and stripes of gold and brown that shift when the stone is rotated. Major sources include South Africa (Northern Cape), Australia, Myanmar, and Namibia.

Identified on: 5/2/2026

Mode: Standard