Eudialyte Gemstone & Information | Gemopedia by JTV | Gemopedia™

Eudialyte

Discovered 1819 in Greenland, this gemstone is usually found in massive forms in host rocks. Eudialyte is an extremely rare and complex mineral that occurs in red-violets, pinks, blues, yellows and browns. Well-formed crystals are rare, and opaque material is often fashioned in cabochons.

Colors

Red, Pink, Reddish Brown, Brown, Yellow, Yellowish Brown

  • Eudialyte classification

    CommonName
    Eudialyte
    Species
    Eudialyte
    Variety
    Colors
    Red, Pink, Reddish Brown, Brown, Yellow, Yellowish Brown
    AlternateNames
    GemstoneGroups
    KeySeparations
    RI
    ClassificationComments
    Might be mildly radioactive due to Cerium content.
  • Eudialyte chemistry & crystallography

    ChemicalName
    ChemicalFormula
    Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2
    Synthesis
    CrystalSystem
    Trigonal
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline to Aggregate
    ChemistryComments
  • Eudialyte optical properties

    Transparency
    Translucent - Opaque
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    1.591-1.633
    Birefringence
    0.003-0.01
    OpticCharacter
    Uniaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    Unobservable
  • Eudialyte characteristic physical properties

    Hardness
    5-5.5
    CharacteristicComments
    Streak
    White To Pale Pink
    SpecificGravity
    2.74-3
    Toughness
    Poor
    Inclusions
    Luster
    Vitreous
    Stability
    Poor
    Fracture
    Uneven
    Cleavage
    Perfect, in one direction, Poor, in one direction