Color Change Spinel Gemstone & Information | Gemopedia by JTV | Gemopedia™

Color Change Spinel

Along with a rich range of hues, spinel offers color-change varieties. Color change spinel usually appears violet blue under fluorescent light and purple under incandescent light. Spinel is one of few gemstones that require no special treatments; its beautiful, vivid colors and clarity are entirely natural. Spinel is also excellent for use in jewelry because it is hard, tough, and often more affordable than ruby or sapphire.

Colors

Medium-Dark Purple Incandescent, Medium To Dark Violetish Blue In Daylight, Fluorescent Light

  • Color-change-spinel classification

    CommonName
    Color Change Spinel
    Species
    Spinel
    Variety
    Color Change Spinel
    Colors
    Medium-Dark Purple Incandescent, Medium To Dark Violetish Blue In Daylight, Fluorescent Light
    AlternateNames
    GemstoneGroups
    Spinel
    KeySeparations
    Color change, RI and SG, lack of doubling, SR nature and spectrum
    ClassificationComments
  • Color-change-spinel chemistry & crystallography

    ChemicalName
    magnesium aluminum oxide
    ChemicalFormula
    MgAl2O4
    Synthesis
    CrystalSystem
    Cubic
    ChemistryClassification
    Oxide
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Color-change-spinel optical properties

    Transparency
    Transparent
    Dispersion
    Strength: weak fire Value: 0.02
    OpticalComments
    RefractiveIndex
    1.718
    Tolerance:(+0.017/-0.008)
    Birefringence
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Singly Refractive (SR)
    Fluorescence
    SWUV: Inert
    LWUV: Moderate to strong chalky red
    CCFReaction
    Pleochroism
    None
  • Color-change-spinel characteristic physical properties

    Hardness
    8
    CharacteristicComments
    Streak
    SpecificGravity
    3.57-3.7 Typical:3.6
    Toughness
    Varies
    Inclusions
    Natural mineral inclusions like spinel or apatite, needles, negative crystals in the shape of an octahedral, and fingerprints.
    Luster
    SubAdamantine
    Stability
    Very Good
    Fracture
    Conchoidal
    Cleavage
    None