mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Hardness: 6.5-7 Mohs; Color: Golden-brown to yellow with chatoyancy; Luster: Silky to vitreous; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific gravity: 2.64-2.71

Hardness: 6
Color: Golden-brown to yellow with chatoyancy
Luster: Silky to vitreous

Identified April 9, 2026More mineral →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Golden-brown to yellow with chatoyancy; Luster: Silky to vitreous; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific gravity: 2.64-2.71

Formation & geological history

Formed when silica-rich fluids replace the fibrous mineral crocidolite (blue asbestos) while retaining its fibrous structure, a process known as pseudomorphism. Most deposits are found in Precambrian metamorphic rocks.

Uses & applications

Extensively used in jewelry (cabochons, beads), decorative carvings, and as a popular collected gemstone for its chatoyant optical effect.

Geological facts

The chatoyancy (cat's-eye effect) is caused by the parallel reflection of light off the internal fibrous structure. It was once considered a rare and highly valuable gemstone in the late 19th century until large deposits were found in South Africa.

Field identification & locations

Identified by its distinctive yellowish-brown bands and silky, shimmering effect when moved under light. Major sources include South Africa, Australia, Burma, and India.

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