mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Fe2O3)

Hardness: 6.5-7.0 (Mohs); Color: Golden-yellow to brown; Luster: Silky; Crystal structure: Trigonal (fibrous); Cleavage: None; Specific gravity: 2.64-2.71; Notable for chatoyancy (the cat's-eye effect).

Hardness: 6
Color: Golden-yellow to brown
Luster: Silky

Identified February 23, 2026More mineral →

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Physical properties

Formation & geological history

Formed through a process known as pseudomorphism, where quartz replaces the mineral crocidolite (blue asbestos) over millions of years while retaining the fibrous structure. Primarily found in Precambrian iron formations.

Uses & applications

Used extensively in jewelry (cabochons, beads), decorative carvings, and as a popular collector's mineral. Occasionally used in interior design applications like inlay work.

Geological facts

The unique 'shimmer' is caused by light reflecting off the parallel fibers of the mineral. When iron is lacking in the formation, it remains blue and is called 'Hawk\'s Eye'. It has been worn as an amulet against curses since ancient Roman times.

Field identification & locations

Identify in the field by its distinctive golden-brown bands and the 'moving' light effect (chatoyancy) when tilted. Major locations include South Africa (Northern Cape), Western Australia, India, and Namibia.

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