Tugtupite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Tugtupite

Tugtupite gets its unique name from the location of its discovery in southwest Greenland. This semi-transparent to opaque mineral species is usually pink to red and often mottled with white, gray or black. Nicknamed the "Reindeer Stone," tugtupite is tenebrescent; when stored in darkness, the gem's color will fade, but returns immediately upon exposure to daylight. Among collectors, tugtupite is also prized for its luminescent properties: strong fluorescence and less commonly, phosphorescence, when the gem continues to fluoresce even after the ultraviolet light source has been removed.

Colors

Usually Pink To Red, Often Mottled With White, Gray, Black; Rarely Light Blue

  • Tugtupite classification

    CommonName
    Tugtupite
    Species
    Tugtupite
    Variety
    Colors
    Usually Pink To Red, Often Mottled With White, Gray, Black; Rarely Light Blue
    AlternateNames
    Reindeer Stone
    GemstoneGroups
    KeySeparations
    appearance, RI, SG and fluorescence
    ClassificationComments
    Misnomer: beryllium sodalite. Piezoelectric: development of opposite charges at the ends of a tourmaline crystal when placed under stress.
  • Tugtupite chemistry & crystallography

    ChemicalName
    ChemicalFormula
    Na4AlBeSi4O12Cl
    Synthesis
    CrystalSystem
    Tetragonal
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline to Aggregate
    ChemistryComments
  • Tugtupite optical properties

    Transparency
    Translucent - Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    1.496-1.502
    Birefringence
    0.006
    OpticCharacter
    Uniaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert to moderate orange-red
    LWUV: moderate to strong orange-red
    CCFReaction
    Pleochroism
    Dichroic, moderate purplish red and orange-red
  • Tugtupite characteristic physical properties

    Hardness
    4-6.5
    CharacteristicComments
    Streak
    SpecificGravity
    2.3-2.58 Typical:2.36
    Toughness
    Good
    Inclusions
    Luster
    Vitreous
    Stability
    Fracture
    Conchoidal, Uneven
    Cleavage
    None