Tiger's Eye
Quartz var. Tiger's Eye (Pseudomorph of Quartz after Crocidolite) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal (microcrystalline); usually occurs in massive, fibrous, or platy habits rather than distinct crystals.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (with inclusions of oxidized Limonite/Goethite)
Formation Process
Pseudomorphic replacement of fibrous crocidolite (blue asbestos) by chalcedony/quartz, where iron remains as limonite to provide golden-brown color.
About This Crystal
An opaque, fibrous quartz variety with a silky luster. It displays alternating bands of golden-yellow, bronze, and deep brown, exhibiting a strong chatoyant 'eye' effect when moved.
Physical Characteristics
Color: Gold, brown, and yellow; Streak: Yellow-brown; Cleavage: None; Fracture: Conchoidal/Splintery; SG: 2.64-2.71; Luster: Vitreous to Silky.
Optical Properties
Displays prominent chatoyancy (cat's eye effect) due to the parallel alignment of the fibrous inclusions. RI: 1.544-1.553; Birefringence: 0.009.
Hardness & Durability
Origin Region
South Africa (Griequaland West), Western Australia, Myanmar, India, and Namibia.
Hardness & Durability
Mohs Hardness: 6.5 to 7. Excellent durability for jewelry and daily wear; resistant to scratching by most household items.
Care & Maintenance
Cleans easily with warm soapy water and a soft brush. Avoid harsh acids (like hydrofluoric acid) and prolonged exposure to high heat. Safe for ultrasonic cleaning.
Rarity & Value
Common and widely available. Value is determined by the strength of the chatoyancy, evenness of banding, and lack of dull spots. Prices are generally affordable.
Special Characteristics
Chatoyancy: The 'moving light' effect caused by light reflecting off the internal fibers; if primarily blue, it is known as Hawk's Eye.
Lore & History
Historically worn by Roman soldiers for protection in battle. In traditional lore, it is considered a stone of courage, willpower, and solar energy, associated with the Solar Plexus chakra.