Tiger's Eye (dark/grey variant)

Physical Properties

Hardness: 6.5-7.0 (Mohs); Color: Dark grey, brownish-black with chatoyancy; Luster: Silky; Crystal Structure: Trigonal/Fibrous; Specific Gravity: 2.64-2.71

Formation & Geological History

Formed through a metamorphic process where quartz replaces the asbestos mineral crocidolite via pseudomorphism. This maintains the fibrous structure responsible for the optical effect.

Uses & Applications

Primarily used for jewelry (cabochons, beads), decorative carvings, and as a popular meditation or collector's stone.

Geological Facts

The shimmering effect seen in this stone is called chatoyancy. While the gold/brown variety is most common, darker variants like this can occur naturally or through heat treatment.

Field Identification & Locations

Identify by rotating under light to observe the moving silky band (chatoyancy). It is commonly found in South Africa and Western Australia. Collectors look for sharp, clean bands.

Identified on: 5/16/2026

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