mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Hardness: 7 Mohs; Color: Golden-brown to yellow with chatoyant layering; Luster: Silky; Crystal Structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 2.64-2.71

Hardness: 7 Mohs
Color: Golden-brown to yellow with chatoyant layering
Luster: Silky

Identified June 20, 2026More mineral →

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Physical properties

Hardness: 7 Mohs; Color: Golden-brown to yellow with chatoyant layering; Luster: Silky; Crystal Structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 2.64-2.71

Formation & geological history

Formed through a pseudomorphic process where silica (quartz) replaces the fibrous mineral crocidolite (blue asbestos) while maintaining the fibrous structure, creating chatoyancy. Common in Precambrian banded iron formations.

Uses & applications

Extensively used in jewelry (beads, cabochons), ornamental carvings, decorative tiles, and as a popular collector specimen for its optical effects.

Geological facts

The unique optical effect is called chatoyancy, or the 'cat-eye effect'. When cut into a cabochon, a light band moves across the stone as it is turned. If the iron is oxidized differently, it can turn red (Bull's Eye) or remain blue (Hawk's Eye).

Field identification & locations

Identify by its distinct golden-brown color bands and the silky luster that changes as it reflects light. It is commonly found in South Africa, Western Australia, Burma, and India. Collectors should look for vibrant banding and strong chatoyancy.

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