mineral

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2)

Hardness: 7 Mohs; Color: Golden brown to yellow with dark bands; Luster: Silky to vitreous; Crystal structure: Hexagonal/Trigonal (fibrous); Cleavage: None; Specific Gravity: 2.64–2.71

Hardness: 7 Mohs
Color: Golden brown to yellow with dark bands
Luster: Silky to vitreous

Identified March 16, 2026More mineral →

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Physical properties

Hardness: 7 Mohs; Color: Golden brown to yellow with dark bands; Luster: Silky to vitreous; Crystal structure: Hexagonal/Trigonal (fibrous); Cleavage: None; Specific Gravity: 2.64–2.71

Formation & geological history

Formed when quartz replaces the fibrous mineral crocidolite (blue asbestos) through a process called pseudomorphism, while maintaining the original fibrous structure. Found in iron formations and Precambrian rocks.

Uses & applications

Primarily used in jewelry (cabochons), carvings, and ornamental lapidary arts. It is a popular stone for metaphysical collecting and tumble polishing.

Geological facts

The shimmering effect is called chatoyancy (cat-eye effect). Historically, Tiger's Eye was used by Roman soldiers for protection in battle and was once considered as valuable as diamonds until large deposits were found.

Field identification & locations

Identify in the field by its distinct golden-brown fibrous layers and 'moving' light bands (chatoyancy) when rotated. Commonly found in South Africa, Australia, and Brazil. Collectors should look for distinct, clean banding.

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