Ussingite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Ussingite

Named after Niels Viggo Ussing, professor of Mineralogy at the University of Copenhagen, this rare silicate mineral can be found in only a few locations worldwide including Greenland and northern Russia. It typically has a massive habit and can be light pink, lilac-blue, and in rare cases dark violet-red.

Colors

Pale Pink, Lilac-Blue, Red-Violet

  • Ussingite classification

    CommonName
    Ussingite
    Species
    Ussingite
    Variety
    Colors
    Pale Pink, Lilac-Blue, Red-Violet
    AlternateNames
    GemstoneGroups
    KeySeparations
    RI and fluorescence.
    ClassificationComments
    It is often confused with sodalite, but it does not fluoresce.
  • Ussingite chemistry & crystallography

    ChemicalName
    sodium aluminum silicate hydroxide
    ChemicalFormula
    Na4Al2Si6O17.H2O
    Synthesis
    CrystalSystem
    Triclinic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Ussingite optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    OpticalComments
    RefractiveIndex
    1.545-1.509
    Birefringence
    0.041
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: inert
    CCFReaction
    Pleochroism
    Unobservable
  • Ussingite characteristic physical properties

    Hardness
    6-7
    CharacteristicComments
    Streak
    SpecificGravity
    2.457-2.5
    Toughness
    Poor
    Inclusions
    Luster
    Vitreous
    Stability
    Fracture
    Irregular, Uneven
    Cleavage
    Perfect