mineral

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2)

Hardness: 7 on Mohs scale; Color: Golden-yellow to brown; Luster: Silky to chatoyant; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific Gravity: 2.64-2.71

Hardness: 7 on Mohs scale
Color: Golden-yellow to brown
Luster: Silky to chatoyant

Identified May 22, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Golden-yellow to brown; Luster: Silky to chatoyant; Crystal structure: Trigonal/Fibrous; Cleavage: None; Specific Gravity: 2.64-2.71

Formation & geological history

Formed through a process called pseudomorphism, where silica replaces fibrous crocidolite (blue asbestos) while maintaining the fibrous structure. Primarily occurring in metamorphic environments.

Uses & applications

Used extensively in the jewelry industry for cabochons, beads, and carvings. Also used as decorative stones and collected for its chatoyant ('cat-eye') optical effect.

Geological facts

The optical effect is caused by light reflecting off the internal fibers. It was once considered a rare and precious stone in the early 19th century before large deposits were found.

Field identification & locations

Identify by its characteristic golden-brown bands and chatoyant shimmer when rotated under light. Commonly found in South Africa, Western Australia, USA, and Myanmar.

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