mineral

Tiger's Eye

Silicon Dioxide (SiO2) with fibrous inclusions of Crocidolite

Hardness: 6.5-7 Mohs; Color: Golden yellow to brown; Luster: Silky; Crystal Structure: Trigonal (fibrous habit); Cleavage: None; Specific Gravity: 2.64–2.71

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

Identified June 12, 2026More mineral →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Golden yellow to brown; Luster: Silky; Crystal Structure: Trigonal (fibrous habit); Cleavage: None; Specific Gravity: 2.64–2.71

Formation & geological history

Formed when quartz replaces crocidolite (asbestos) through pseudomorphism, maintaining the fibrous structure while turning the iron minerals into golden limonite. Formed primarily in metamorphic environments.

Uses & applications

Predominantly used as a gemstone in jewelry (cabochons, beads), decorative carvings, and as a popular collector's specimen due to its chatoyancy.

Geological facts

The optical phenomenon of the moving light band is called chatoyancy. Historically, it was worn as an amulet against curses and bad luck. It is commonly associated with the band-iron formations of South Africa.

Field identification & locations

Identify in the field by its distinct golden-yellow bands and 'cat's eye' effect when tilted. Commonly found in South Africa, Western Australia, India, and Namibia.

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