Tiger's-Eye Quartz Gemstone & Information | Gemopedia by JTV | Gemopedia™

Tiger's-Eye Quartz

Tiger's eye is a unique and mysterious member of the quartz family. It ranges in color from rich, golden yellow to bronze and brown. Best seen when gems are cut en cabochon, tiger's eye displays an optical phenomenon known as chatoyancy. Unlike other chatoyant gems, tigers eye quartz is made up of quartz with intergrown fibers of amphibole that were altered to golden or rusty-brown limonite. When light hits the surface of this gem, a silky, wavy shimmer moves across the surface of the stone resembling the eye of a tiger. A related variety of quartz, called hawks eye, is blue due to unaltered inclusions of crocidolite.

Colors

Brownish Yellow To Brownish Reddish Brown Unless Dyed Then Stones Can Be Any Color

  • Tigers-eye-quartz classification

    CommonName
    Tiger's-Eye Quartz
    Species
    Quartz
    Variety
    Tiger's-Eye
    Colors
    Brownish Yellow To Brownish Reddish Brown Unless Dyed Then Stones Can Be Any Color
    AlternateNames
    Hawk-Eye, Falcon's-Eye, Zebra Tiger's-Eye, Cat's-Eye
    GemstoneGroups
    KeySeparations
    Color, appearance, structure and RI
    ClassificationComments
    Misnomer: crocidolite. Tiger's-eye is formed by parallel intergrowth of quartz crystals and altered amphibole fibers that mostly turned into limonite.
  • Tigers-eye-quartz chemistry & crystallography

    ChemicalName
    silicon dioxide (aka silica)
    ChemicalFormula
    SiO2
    Synthesis
    CrystalSystem
    Trigonal
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Macrocrystalline
    ChemistryComments
  • Tigers-eye-quartz optical properties

    Transparency
    Semitranslucent - Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    1.544-1.553
    Tolerance:very constant
    Birefringence
    0.009
    OpticCharacter
    Uniaxial
    OpticSign
    Positive
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    None
  • Tigers-eye-quartz characteristic physical properties

    Hardness
    7
    CharacteristicComments
    Streak
    Yellow-Brown
    SpecificGravity
    2.64-2.69 Typical:2.66
    Toughness
    Good
    Inclusions
    Tiger's-eye has a wavy fibrous structure. If the stone is dyed there will be dye concentrations along the fibers.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Splintery
    Cleavage
    None