mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 Mohs; Color: Golden-brown to yellow with chatoyancy; Luster: Silky; Crystal Structure: Hexagonal/Trigonal; Cleavage: None; Specific Gravity: 2.64-2.71

Hardness: 7 Mohs
Color: Golden-brown to yellow with chatoyancy
Luster: Silky

Identified July 19, 2026More mineral →

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Physical properties

Hardness: 7 Mohs; Color: Golden-brown to yellow with chatoyancy; Luster: Silky; Crystal Structure: Hexagonal/Trigonal; Cleavage: None; Specific Gravity: 2.64-2.71

Formation & geological history

Formed when quartz replaces parallel fibers of crocidolite asbestos through a process called pseudomorphism, primarily in metamorphic environments. Large deposits are found in Precambrian iron formations.

Uses & applications

Polished for use in jewelry (cabochons, beads), decorative carvings, and as a popular pocket stone for collectors.

Geological facts

The shimmering effect is called chatoyancy (cat's eye effect), caused by the orientation of the underlying fibers. It is often found associated with Tiger's Iron, which includes hematite and jasper.

Field identification & locations

Identify by its distinctive silky luster and bandas of light that move across the surface when it is rotated. Most commonly sourced from South Africa and Australia.