Tiger's Eye

Physical Properties

Hardness: 6.5-7 (Mohs); Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal (fibrous); Cleavage: None; Chatoyancy (cat's-eye effect).

Formation & Geological History

Formed through a metamorphic process where quartz replaces the fibers of the mineral crocidolite (blue asbestos). Over millions of years, the chemical replacement preserves the fibrous structure but turns the mineral golden-brown through iron oxidation.

Uses & Applications

Predominantly used as a gemstone for jewelry (beads, cabochons), ornamental carvings, and as a popular specimen for crystal collectors.

Geological Facts

Tiger's Eye is a 'pseudomorph,' meaning 'false form.' It has the chemical composition of quartz but the original physical shape of the fibrous asbestos it replaced. It is the anniversary gemstone for the 9th year of marriage.

Field Identification & Locations

Identify in the field by its distinctive golden-brown bands and chatoyancy (the way light moves across the fibers like a spool of silk). Primarily found in South Africa and Western Australia.

Identified on: 4/17/2026

Mode: Standard