Tiger's Eye

Physical Properties

Hardness: 6.5-7 on Mohs scale; Color: Golden yellow to deep brown with silky luster; Crystal structure: Trigonal (fibrous texture); Cleavage: None; Specific gravity: 2.64-2.71.

Formation & Geological History

Formed when quartz replaces fibrous crocidolite (blue asbestos) while retaining the original fibrous structure. Most deposits are approximately 2 billion years old, found in metamorphosed iron formations.

Uses & Applications

Primarily used in jewelry (beads, cabochons), ornamental carvings (like the seahorse shown), and as a popular collector's mineral.

Geological Facts

The unique shimmer is called chatoyancy, or the 'cat-eye effect.' It is considered a pseudomorph because it is quartz that has taken the form of another mineral.

Field Identification & Locations

Identify by the shifting bands of light (chatoyancy) when rotated. Major deposits are found in South Africa, Australia, and Thailand. High-quality pieces show distinct, sharp light ribbons.

Identified on: 5/2/2026

Mode: Standard