mineral

Tiger's Eye

Silicon Dioxide (SiO2) with Limonite/Goethite inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale. Color: Golden to red-brown. Luster: Silky. Crystal structure: Trigonal (fibrous). Cleavage: None. Specific gravity: 2.64-2.71. Displays distinct chatoyancy (optical reflectance).

Hardness: 6
Color: Golden to red-brown
Luster: Silky

Identified May 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed when quartz gradually replaces fibrous crocidolite (asbestos) through a process of pseudomorphism/metamorphism. Often found in Banded Iron Formations dating back to the Proterozoic Era.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, spiritual/metaphysical collecting, and as a semi-precious ornamental stone.

Geological facts

Formerly thought to be a pseudomorph of quartz after crocidolite, recent research suggests it may involve a concurrent growth process. It is the 9th wedding anniversary gemstone.

Field identification & locations

Identified by its unique silky luster and vertical fibrous bands that create a 'cat's eye' effect when tilted. Primary sources include South Africa (Northern Cape), Australia, and Namibia.