metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Golden yellow to brown, multi-toned; Luster: Silky; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific gravity: 2.64-2.71; Notable for its chatoyancy effect.

Hardness: 6
Color: Golden yellow to brown, multi-toned
Luster: Silky

Identified January 22, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when the mineral crocidolite is replaced by silica (quartz) while retaining the original fibrous structure. This metamorphic process creates a 'pseudomorph' where quartz takes on the shape of another mineral's fibers.

Uses & applications

Primarily used as a gemstone in jewelry, decorative carvings, and as a semi-precious stone for metaphysical collecting. It is also used in small industrial decorative accents.

Geological facts

Tiger's eye exhibits a unique optical effect called chatoyancy, which creates a vertical band of reflected light resembling a cat's eye. Ancient Roman soldiers wore it for protection in battle.

Field identification & locations

Identify in the field by its distinct golden-brown fibrous bands and the way the light shifts over the surface when rotated. Major deposits are found in South Africa, Western Australia, India, and Namibia.

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