Mineral (Pseudomorph)

Blue Tiger's Eye

Silicon Dioxide (SiO2) with Crocidolite inclusions

AI-generated identification · may be incorrect

Hardness: 6.5–7 on Mohs scale; Color: Dark blue to blue-gray with silky bands; Luster: Silky/Vitreous; Crystal Structure: Trigonal (fibrous); Cleavage: None; Specific Gravity: 2.64–2.71

Hardness: 6
Color: Dark blue to blue-gray with silky bands
Luster: Silky/Vitreous

Identified March 25, 2026More mineral (pseudomorph) →

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Physical properties

Hardness: 6.5–7 on Mohs scale; Color: Dark blue to blue-gray with silky bands; Luster: Silky/Vitreous; Crystal Structure: Trigonal (fibrous); Cleavage: None; Specific Gravity: 2.64–2.71

Formation & geological history

Formed through the partial replacement of crocidolite (blue asbestos) fibers by quartz. Unlike gold Tiger's Eye, the iron in this variety has not oxidized, preserving the blue color. Found in Precambrian rocks.

Uses & applications

Primarily used for lapidary work, jewelry (beads, cabochons), and ornamental carvings. Also popular in metaphysical collections.

Geological facts

Also known as Falcon's Eye. It exhibits a unique optical phenomenon called chatoyancy (the 'cat's eye' effect), which is caused by light reflecting off the internal fibrous structure.

Field identification & locations

Identify by its unique silky blue chatoyancy when rotated under light. Common locations include South Africa, Western Australia, Brazil, and India. It is easily distinguished from gold Tiger's Eye by color.