mineral

Tiger's Eye

Fibrous Quartz (SiO2) with Limonite

Hardness: 6.5-7 Mohs; Color: Golden yellow to deep brownish-red; Luster: Silky; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None; Chatoyancy (cat's-eye effect).

Hardness: 6
Color: Golden yellow to deep brownish-red
Luster: Silky

Identified June 25, 2026More mineral →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Golden yellow to deep brownish-red; Luster: Silky; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None; Chatoyancy (cat's-eye effect).

Formation & geological history

A pseudomorph formed when quartz replaces crocidolite asbestos fibers, retaining the fibrous structure. Iron oxides like limonite provide the golden color. Commonly found in banded iron formations approximately 2 billion years old.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collector's stone.

Geological facts

The 'tiger's eye' effect is due to the parallel orientation of the quartz fibers. It is considered a protective stone in many cultures and was historically used by Roman soldiers for protection in battle.

Field identification & locations

Identify by its characteristic silky luster and shifting bands of light (chatoyancy) when rotated. Major deposits are found in South Africa, Australia, and Namibia.