Spodumene Gemstone & Information | Gemopedia by JTV | Gemopedia™

Spodumene

Spodumene is the name of a mineral species that includes two very special gems varieties: kunzite and hiddenite. Spodumene is named from the Greek spodoumenos, meaning "burnt to ash," which alludes to the ashy color of many specimens. A member of the pyroxene group, spodumene belongs to a class of minerals called silicates and it is one of a small number of minerals that contain lithium. Spodumene also occurs in many other shades of colors, all pale but very clear and brilliant. These varieties are given color descriptor names; for example, lemon spodumene.

Colors

Pink To Bluish Purple, Green, Yellow, Colorless, Gray, Blue (Very Rare)

  • Spodumene classification

    CommonName
    Spodumene
    Species
    Spodumene
    Variety
    Colors
    Pink To Bluish Purple, Green, Yellow, Colorless, Gray, Blue (Very Rare)
    AlternateNames
    Triphane, Kunzite, Hiddenite
    GemstoneGroups
    KeySeparations
    RI, birefringence, optic character and spectra. Biaxial common point is 0.006 from high RI.
    ClassificationComments
    Triphane: yellow. Kunzite: pink to bluish purple. Hiddenite: medium to emerald green. Misnomers: Lithia emerald, hiddenite if light green or irradiated
  • Spodumene chemistry & crystallography

    ChemicalName
    lithium aluminum silicate
    ChemicalFormula
    LiAlSi2O6
    Synthesis
    CrystalSystem
    Monoclinic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Spodumene optical properties

    Transparency
    Transparent
    Dispersion
    Strength: moderate fire Value: 0.017
    OpticalComments
    RefractiveIndex
    1.66-1.676
    Tolerance:(+0.005/-0.005)
    Birefringence
    0.014-0.016
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert to moderate orange-red
    LWUV: inert to strong orange-red
    CCFReaction
    Pleochroism
    Trichroic, strong, varying shades of body color
  • Spodumene characteristic physical properties

    Hardness
    6.5-7
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.15-3.21 Typical:3.18
    Toughness
    Poor
    Inclusions
    Spodumene is a type I clarity stone. Stones might contain growth and etch tubes, healing cracks, liquid and multi-phase inclusions.
    Luster
    Vitreous
    Stability
    Fracture
    Uneven, Splintery
    Cleavage
    Perfect, in two directions