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

Diopside (Cat's-Eye)

The term cat's eye, or chatoyancy, is used to describe a phenomenal optical property in gemstones, in this case diopside. 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.

Colors

Bluish Green To Yellowish Green To Dark Green, Black

  • Diopside-cats-eye classification

    CommonName
    Diopside (Cat's-Eye)
    Species
    Diopside
    Variety
    Cat's-Eye Diopside
    Colors
    Bluish Green To Yellowish Green To Dark Green, Black
    AlternateNames
    GemstoneGroups
    Pyroxene
    KeySeparations
    RI, spectrum and might show birefringence blink
    ClassificationComments
  • Diopside-cats-eye chemistry & crystallography

    ChemicalName
    calcium magnesium silicate
    ChemicalFormula
    CaMgSi2O6
    Synthesis
    CrystalSystem
    Monoclinic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Diopside-cats-eye optical properties

    Transparency
    Semitransparent - Opaque
    Dispersion
    Strength: moderate fire Value: 0.02
    OpticalComments
    RefractiveIndex
    1.675-1.701
    Tolerance:(+0.029/-0.010)
    Birefringence
    0.024-0.03
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: possibly green
    CCFReaction
    Pleochroism
    Dichroic, weak to strong light green or yellowish green and dark green
  • Diopside-cats-eye characteristic physical properties

    Hardness
    5-6
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.22-3.4 Typical:3.29
    Toughness
    Poor
    Inclusions
    Black needle-like magnetite inclusions that might be magnetic, metallic like inclusions and liquid inclusions.
    Luster
    Vitreous
    Stability
    Fair
    Fracture
    Conchoidal, Uneven
    Cleavage
    Good, in two directions