Mineral

Tiger's Eye

Silicon Dioxide (SiO2) with Limonite/Goethite pseudomorphs after Crocidolite

Hardness: 6.5-7.0 (Mohs); Color: Golden to reddish-brown; Luster: Silky to glassy; Crystal structure: Hexagonal/Trigonal (microcrystalline); Chatoyant (cat's eye effect); Specific gravity: 2.64-2.71

Hardness: 6
Color: Golden to reddish-brown
Luster: Silky to glassy

Identified May 9, 2026More mineral →

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Physical properties

Hardness: 6.5-7.0 (Mohs); Color: Golden to reddish-brown; Luster: Silky to glassy; Crystal structure: Hexagonal/Trigonal (microcrystalline); Chatoyant (cat's eye effect); Specific gravity: 2.64-2.71

Formation & geological history

Formed through a process called pseudomorphism, where silica replaces the fibrous blue mineral crocidolite, which then oxidizes to iron-rich limonite, creating the gold and brown hues. Commonly found in metamorphic host rocks.

Uses & applications

Primarily used as a gemstone in jewelry, beads, cabochons, and ornamental carvings. It is also a very popular mineral for collectors and metaphysical enthusiasts.

Geological facts

It is a prime example of chatoyancy, the 'cat-eye' effect caused by the reflection of light from the preserved fibrous structure of the original crocidolite mineral. Blue variants are known as Hawk's Eye.

Field identification & locations

Identify by its unique 'moving' golden bands when tilted under light. Common locations include South Africa (major producer), Western Australia, India, and Namibia. In the field, look for fibrous quartz seams in iron-rich geological regions.

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