Tiger's Eye
Pseudomorph of Quartz after Crocidolite · Semi-Precious Gemstone
Crystal System
Trigonal crystal system; typically occurs in a fibrous, massive habit due to its pseudomorphic nature.
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 (with inclusions of oxidized Limonite/Goethite FeO(OH))
Formation Process
Metamorphic/Hydrothermal; it forms through the replacement of fibrous blue crocidolite asbestos by silica, where iron oxides produce the golden-brown color.
About This Crystal
An opaque, fibrous quartz variety exhibiting a silky luster and golden to reddish-brown bands. This specific specimen is carved into a polished hexagonal point.
Physical Characteristics
Color: Gold-brown with dark bands; Streak: Yellow-brown; Fracture: Splintery to conchoidal; Specific Gravity: 2.64-2.71; Non-fluorescent.
Optical Properties
Displays distinct chatoyancy (cat's eye effect) caused by the reflection of light off the parallel mineral fibers within the stone.
Hardness & Durability
Origin Region
Primarily South Africa (Northern Cape Province), Australia, India, and Myanmar.
Hardness & Durability
Mohs hardness: 6.5 to 7. Good toughness; suitable for daily jewelry wear but susceptible to strong acids.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners and harsh chemicals like hydrofluoric acid or bleach.
Rarity & Value
Common and affordable. Value is determined by the sharpness of the chatoyant band (the 'eye'), color saturation, and quality of polish.
Special Characteristics
Chatoyancy is the defining feature; when the iron content is less oxidized, it can appear blue (known as Hawk's Eye).
Lore & History
Historically used by Roman soldiers for protection in battle. Metaphysically associated with the Solar Plexus chakra, courage, and grounding.