gemstone

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Hardness: 6.5-7.0 (Mohs scale), Color: Golden to red-brown, Luster: Silky, Crystal Structure: Hexagonal (trigonal), Cleavage: None, Specific Gravity: 2.64-2.71, Feature: Chatoyancy (cat's eye effect)

Hardness: 6

Identified July 9, 2026More gemstone →

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Physical properties

Hardness: 6.5-7.0 (Mohs scale), Color: Golden to red-brown, Luster: Silky, Crystal Structure: Hexagonal (trigonal), Cleavage: None, Specific Gravity: 2.64-2.71, Feature: Chatoyancy (cat's eye effect)

Formation & geological history

Formed when quartz replaces the mineral crocidolite (blue asbestos) while maintaining its fibrous structure; primarily found in iron-rich sedimentary formations of Precambrian age.

Uses & applications

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

Geological facts

It is a member of the chalcedony family. The unique 'cat's eye' effect is caused by the reflection of light off the parallel fibers of the replaced mineral within the quartz matrix.

Field identification & locations

Identified by its distinctive golden-brown bands and moving light reflection when rotated. Major deposits are found in South Africa, Western Australia, India, and Burma.

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