Tiger's Eye
Quartz var. Tiger's Eye (Pseudomorph of Quartz after Crocidolite) · Semi-Precious Gemstone / Metamorphic Rock-constituent
Crystal System
Trigonal/Hexagonal system (Quartz structure); usually found in massive habit with a fibrous texture inherited from crocidolite.
Mineral Group
Silicates (Tectosilicate group)
Chemical Formula
SiO2 (Silicon Dioxide) with inclusions of altered iron oxide (primarily Limonite/Goethite)
Formation Process
Pseudomorphic formation where silica replaces fibers of crocidolite asbestos, while iron staining creates the golden-brown hues.
About This Crystal
A chatoyant gemstone with a silky luster. It displays alternating bands of golden-yellow, bronze, and deep brown. The specimen shown is a polished double-terminated point (wand) exhibiting typical parallel fibrous structuring.
Physical Characteristics
Color: Golden yellow to deep brown; Streak: Yellow-brown; Cleavage: None; Fracture: Conchoidal to splintery (due to fibers); Density: 2.64-2.71; Fluorescence: Usually inert.
Optical Properties
Displays distinct chatoyancy (cat's eye effect) due to the reflection of light off the parallel fibrous inclusions. Refractive Index: 1.544-1.553; Uniaxial (+).
Hardness & Durability
Origin Region
Primary source is South Africa (Northern Cape); also found in Western Australia, India, Burma, and Namibia.
Hardness & Durability
Mohs Hardness: 6.5–7; Toughness: Good (fibrous structure lends strength); Stable and suitable for daily wear jewelry.
Care & Maintenance
Clean with warm soapy water and a soft brush. While durable, it should be protected from hydrofluoric acid and extreme heat which can alter the iron oxidation state.
Rarity & Value
Common; Value is determined by the crispness of the chatoyant 'eye,' color saturation, and quality of polish. Often heat-treated to create 'Red Tiger's Eye.'
Special Characteristics
Chatoyancy is the defining feature, created by the silky, parallel growth of oxidized amphibole fibers within the quartz matrix.
Lore & History
Historically worn by Roman soldiers for protection and courage; traditionally associated with the solar plexus chakra and believed to promote mental clarity and grounding.