mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Hardness: 6.5-7.0 (Mohs scale), Color: Golden to red-brown, Luster: Silky, Crystal Structure: Trigonal/Fibrous, Cleavage: None, Specific Gravity: 2.64-2.71

Hardness: 6

Identified June 7, 2026More mineral →

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Physical properties

Hardness: 6.5-7.0 (Mohs scale), Color: Golden to red-brown, Luster: Silky, Crystal Structure: Trigonal/Fibrous, Cleavage: None, Specific Gravity: 2.64-2.71

Formation & geological history

Formed through the pseudomorphism of blue crocidolite asbestos by silica. Over millions of years, quartz replaces the asbestos fibers while retaining the fibrous structure, creating chatoyancy.

Uses & applications

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

Geological facts

It is famous for its chatoyancy, or 'cat's eye effect,' which is caused by the reflection of light off the parallel mineral fibers. Most sources are found in iron formations within South Africa.

Field identification & locations

Identify in the field by its distinct golden-brown banded appearance and silky luster that 'shifts' when the stone is rotated. Commonly found in South Africa, Australia, and Namibia.

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