mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Golden brown to brownish yellow with silky luster; Crystal System: Trigonal (fibrous); Specific Gravity: 2.64-2.71; Notable chatoyancy.

Hardness: 6
Color: Golden brown to brownish yellow with silky luster

Identified July 1, 2026More mineral →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Golden brown to brownish yellow with silky luster; Crystal System: Trigonal (fibrous); Specific Gravity: 2.64-2.71; Notable chatoyancy.

Formation & geological history

Formed when quartz replaces crocidolite (blue asbestos) filaments through a process of pseudomorphism, typically in metamorphic environments. It is most commonly associated with the Precambrian period.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular meditation and lapidary stone.

Geological facts

The optical effect 'chatoyancy' is caused by the reflection of light from the parallel fibrous structure within the quartz. It was once considered as valuable as gold back in the late 1800s.

Field identification & locations

Identified by its distinctive golden banding and silky luster that seems to move when the stone is tilted. Found mainly in South Africa (Northern Cape) and Western Australia.