Color-Change Garnet Gemstone & Information | Gemopedia by JTV | Gemopedia™

Color-Change Garnet

Color change garnets are among the rarest, most interesting of all gemstones. This phenomenal gem is in fact a mixture of garnet species. You can observe color change in this gem by viewing it interchangeably in natural and incandescent light.

Colors

Blue, Teal, Greenish Blue, Pink To Red

  • Color-change-garnet classification

    CommonName
    Color-Change Garnet
    Species
    Pyrope-Spessartite
    Variety
    Color-Change Garnet
    Colors
    Blue, Teal, Greenish Blue, Pink To Red
    AlternateNames
    GemstoneGroups
    Garnet
    KeySeparations
    RI, SR nature, magnification, and possibly spectrum. Lack of pleochroism makes clear separation from alexandrite
    ClassificationComments
    Green-blue to teal in color stones are presumed to be colored by vanadium and chromium.Stones are generally intense pink to red under incandescent light and greenish yellow in daylight or fluorescent light.
  • Color-change-garnet chemistry & crystallography

    ChemicalName
    magnesium aluminium garnet or manganese aluminium garnet
    ChemicalFormula
    ((Mg, Mn)3Al2(SiO4)3)
    Synthesis
    CrystalSystem
    Cubic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Color-change-garnet optical properties

    Transparency
    Transparent
    Dispersion
    Strength: moderate fire Value: 0.022
    OpticalComments
    RefractiveIndex
    1.75-1.78
    Birefringence
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Singly Refractive (SR) With ADR
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    None
  • Color-change-garnet characteristic physical properties

    Hardness
    7-7.5
    CharacteristicComments
    Streak
    SpecificGravity
    3.78-3.85
    Toughness
    Good
    Inclusions
    Color-change garnet is a type II clarity stone. Stones sometimes contains rutile, apatite and pyrite mineral inclusions and intersecting needles.
    Luster
    SubAdamantine
    Stability
    Good
    Fracture
    Conchoidal
    Cleavage
    None