Tiger's Eye (Tumbled Blue/Black-Golden variety)

Physical Properties

Hardness: 7 Mohs; Color: Chatoyant bands of dark blue/black and golden-brown; Luster: Silky to vitreous; Crystal Structure: Hexagonal/Trigonal; Specific Gravity: 2.64-2.71.

Formation & Geological History

Formed when quartz replaces fibrous crocidolite (blue asbestos) crystals while maintaining the fibrous structure. The golden color results from the oxidation of iron within the minerals.

Uses & Applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collector's pocket stone.

Geological Facts

It is a prime example of a pseudomorph. When the color remains blue, it is known as Hawk's Eye; when oxidized to gold/brown, it is Tiger's Eye. This specimen shows a transition between the two.

Field Identification & Locations

Identify by its unique 'chatoyancy' (cat's eye effect) where the light reflects off the fibrous bands as you rotate the stone. Commonly found in South Africa and Western Australia.

Identified on: 4/23/2026

Mode: Standard