metamorphic

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2 with iron inclusions)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Golden to red-brown with silky luster; Crystal Structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 2.64-2.71. Known for its distinct chatoyancy.

Hardness: 6
Color: Golden to red-brown with silky luster

Identified March 25, 2026More metamorphic →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Golden to red-brown with silky luster; Crystal Structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 2.64-2.71. Known for its distinct chatoyancy.

Formation & geological history

Formed through the replacement of fibrous asbestos minerals (crocidolite) by silica (quartz) while preserving the fibrous structure. Primarily formed in Precambrian metamorphic rocks roughly 2 billion years old.

Uses & applications

Extensively used in jewelry (cabochons, beads), decorative carvings, and as a popular semi-precious gemstone for collectors and metaphysical enthusiasts.

Geological facts

Tiger's Eye is a classic example of a 'pseudomorph' (false form). It changes its appearance as the observer moves, an optical effect called chatoyancy caused by light reflecting off the internal fibers.

Field identification & locations

Identify in the field by its distinct golden-yellow to brown bands and the 'moving' light effect when rotated. Mostly found in South Africa, Western Australia, USA, and India.