mineral

Tiger's Eye (Rough Slab)

Pseudomorph of Quartz after Crocidolite (SiO2 with Fe-containing inclusions)

Hardness: 7 on Mohs scale; Color: Golden yellow to deep brown with silky chatoyant bands; Luster: Silky to vitreous; Crystal structure: Trigonal/Hexagonal (fibrous aggregate); Cleavage: None; Specific Gravity: 2.64 - 2.71

Hardness: 7 on Mohs scale
Color: Golden yellow to deep brown with silky chatoyant bands
Luster: Silky to vitreous

Identified March 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the replacement of fibrous blue crocidolite asbestos by silica (quartz) while preserving the original fibrous structure. This process is a pseudomorphism. Most deposits are localized in precambrian metamorphosed iron formations, approximately 2 billion years old.

Uses & applications

Predominantly used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for crystal collecting and metaphysical purposes.

Geological facts

Tiger's Eye displays a unique optical effect known as chatoyancy, created by the reflection of light off the parallel mineral fibers within the stone. If the iron content is lower and the stone remains blue, it is known as Hawk's Eye.

Field identification & locations

Identify in the field by its distinct parallel banding and the 'cat's eye' shimmer when tilted under light. It is most famously sourced from the Northern Cape Province in South Africa and the Pilbara region of Western Australia. Collectors look for high luster and sharp, straight chatoyant bands.

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