Star Diopside Gemstone & Information | Gemopedia by JTV | Gemopedia™

Star Diopside

Star diopside exhibits the optical phenomenon called asterism, a star-like pattern created on the surface of a gemstone when light encounters parallel fibrous, or needle-like, inclusions within its crystal structure. Light that strikes the inclusions within the gem reflects off of the inclusions, creating a narrow band of light. When two or more intersecting bands appear, a star pattern is formed. Depending on the crystal, the star may have four, six, or even twelve rays. When only one band forms, it is classified as a "cat's eye."

Colors

Dark Green To Black

  • Star-diopside classification

    CommonName
    Star Diopside
    Species
    Diopside
    Variety
    Star Diopside
    Colors
    Dark Green To Black
    AlternateNames
    GemstoneGroups
    KeySeparations
    4 rayed star, RI, spectrum and might show birefringence blink
    ClassificationComments
    Six rayed stars are possible but rare.
  • Star-diopside chemistry & crystallography

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

    Transparency
    Semitranslucent - Opaque
    Dispersion
    Strength: moderate fire Value: 0.02
    OpticalComments
    RefractiveIndex
    1.675-1.701
    Tolerance:(+0.029/-1.701)
    Birefringence
    0.024-0.03
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    Unobservable
  • Star-diopside characteristic physical properties

    Hardness
    5.5-6
    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