Glass (Cat's-Eye) Gemstone & Information | Gemopedia by JTV | Gemopedia™

Glass (Cat's-Eye)

The term cat's eye, or chatoyancy, is used to describe a phenomenal optical property in gemstones, in this case man-made glass. The effect, when present, appears as a bright, narrow slit similar to the pupils in the eyes of your favorite feline. This phenomenon is caused by parallel fibrous or needle-like inclusions that interfere with the passage of light through the crystal, scattering and reflecting light back to the viewer as a thin line. Although in this case the phenomenon is not natural, it offers an affordable alternative to this rare phenomenon seen with some natural gems.

Colors

Can Be Any Color

  • Glass-cats-eye classification

    CommonName
    Glass (Cat's-Eye)
    Species
    NA
    Variety
    Colors
    Can Be Any Color
    AlternateNames
    Cathaystone, Catseyte, Fiber-Eye
    GemstoneGroups
    KeySeparations
    magnification and apperance
    ClassificationComments
    Cat's-eye glass is made up of bundles of parallel optic fibers.
  • Glass-cats-eye chemistry & crystallography

    ChemicalName
    Silica
    ChemicalFormula
    Synthesis
    CrystalSystem
    NA
    ChemistryClassification
    Nature
    Simulant
    Crystallinity
    Non-Crystalline
    ChemistryComments
  • Glass-cats-eye optical properties

    Transparency
    Semitranslucent - Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    1.7-1.47
    Tolerance:can be OTL
    Birefringence
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Singly Refractive (SR) With ADR
    Fluorescence
    SWUV: Varible
    LWUV: Varible
    CCFReaction
    Pleochroism
    None
  • Glass-cats-eye characteristic physical properties

    Hardness
    5-6
    CharacteristicComments
    Streak
    SpecificGravity
    2.3-4.5
    Toughness
    Poor
    Inclusions
    Cat's-eye glass will have a honeycomb structure when viewed from the side if the cabochon. Stones might have gas bubbles, swirl marks, flow lines or a reflective base.
    Luster
    Vitreous
    Stability
    Fracture
    Conchoidal, Granular, Splintery
    Cleavage
    None