Tiger's Eye

Physical Properties

Hardness: 6.5–7 on Mohs scale; Color: Golden-yellow to brown with silky banding; Luster: Silky; Crystal structure: Trigonal/Fibrous; Specific Gravity: 2.64–2.71; Notable chatoyancy effect.

Formation & Geological History

Formed when quartz replaces the mineral crocidolite (blue asbestos) through a process of hydrothermal alteration, retaining the fibrous structure of the original mineral. This pseudomorphism occurs in metamorphic environments.

Uses & Applications

Primarily used as a semi-precious gemstone in jewelry (rings, pendants, beads), ornamental carvings, and by crystal collectors for its aesthetic and perceived metaphysical properties.

Geological Facts

The unique 'cat's eye' effect (chatoyancy) is caused by the reflection of light off the fibrous structure of the quartz. When the fibers are oriented vertically, the stone appears to 'blink' as it is turned.

Field Identification & Locations

Identify in the field by its distinct golden-brown color bands and the way light moves across the surface (chatoyancy). It is commonly found in Griqualand West, South Africa, and parts of Western Australia.

Identified on: 4/21/2026

Mode: Standard