Tiger's Eye
Pseudomorph of Quartz after Crocidolite · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal internal structure; typically found in massive, fibrous habits
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (with inclusions of oxidized Limonite/Goethite)
Formation Process
Metamorphic; formed via pseudomorphism where silica replaces crocidolite asbestos fibers while retaining the fibrous structure
About This Crystal
Opaque golden to reddish-brown stone with a silky luster and distinct chatoyant bands. This specimen is carved into a character shape, showing localized color zoning and varying fiber directions.
Physical Characteristics
Color: golden-yellow to deep brown; Streak: yellow-brown; Cleavage: none; Fracture: splintery; Specific Gravity: 2.64–2.71; Luster: silky to vitreous.
Optical Properties
Refractive Index: 1.544–1.553; Birefringence: up to 0.009; exhibit strong chatoyancy (cat's eye effect) due to reflected light from the fibrous structure.
Hardness & Durability
Origin Region
South Africa (Northern Cape), Western Australia, India, and Myanmar
Hardness & Durability
Mohs Hardness: 6.5–7.0; Toughness: good; Stability: stable to light but sensitive to strong acids.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid steam/ultrasonic cleaners and harsh chemicals; store separately to avoid scratching softer stones.
Rarity & Value
Common; Value is determined by the strength of the chatoyant 'shimmer' and color saturation; often treated with heat to produce red variants.
Special Characteristics
Chatoyancy (the 'eye' effect) that moves as the stone is rotated; silky fibrous texture visible under magnification.
Lore & History
Historically used as a protective amulet against the 'evil eye' by Roman soldiers; traditionally associated with courage, integrity, and the Solar Plexus chakra.