Ekanite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Ekanite

Ekanite is found in various shades ranging from dark yellow to deep green. It is one of the rare gemstones that is naturally radioactive, and should be handled with care. Internal radioactivity results in ekanite's metamictization, or the degradation of its crystal structure. This results in the very slow, gradual lowering of its refractive index, hardness and specific gravity.

Colors

Dark Green, Yellow, Brown

  • Ekanite classification

    CommonName
    Ekanite
    Species
    Ekanite
    Variety
    Colors
    Dark Green, Yellow, Brown
    AlternateNames
    GemstoneGroups
    KeySeparations
    RI, birefringence, SR nature, appearence
    ClassificationComments
    Ekanite is radioactive. Stones rarely display a 4 rayed star.
  • Ekanite chemistry & crystallography

    ChemicalName
    calcium thorium silicate
    ChemicalFormula
    (Th,U)(Ca,Fe,Pb)2Si8O20
    Synthesis
    CrystalSystem
    Tetragonal
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline to Aggregate
    ChemistryComments
  • Ekanite optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    OpticalComments
    RefractiveIndex
    1.572-1.573
    Birefringence
    0.001
    OpticCharacter
    Uniaxial
    OpticSign
    Negative
    PolariscopeReaction
    Singly Refractive (SR)
    Fluorescence
    SWUV:
    LWUV:
    CCFReaction
    Pleochroism
    Unobservable
  • Ekanite characteristic physical properties

    Hardness
    4.5-6.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.28-3.32 Typical:3.28
    Toughness
    Fair
    Inclusions
    Luster
    Vitreous
    Stability
    Fracture
    Uneven
    Cleavage
    None