Nifontovite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Nifontovite

Nifontovite is a very rare member of the borate family of minerals. Named for Russian geologist Roman V. Nifontov who discovered it in 1961, nifontovite is found in few locations worldwide, including Russia, Mexico and Japan. Mexico is producing the cleanest and largest specimens at this time. Typically, nifontovite is transparent and typically colorless or gray with a vitreous luster. A nifontivite gem, donated in 2009, resides in the Smithsonian's National Gem Collection.

Colors

Colorless To Gray

  • Nifontovite classification

    CommonName
    Nifontovite
    Species
    Nifontovite
    Variety
    Colors
    Colorless To Gray
    AlternateNames
    GemstoneGroups
    KeySeparations
    RI optic character, SG. Might show anomalous interference colors.
    ClassificationComments
  • Nifontovite chemistry & crystallography

    ChemicalName
    hydrated calcium borate hydroxide
    ChemicalFormula
    Ca3B6O6(OH)12.2H2O
    Synthesis
    CrystalSystem
    Monoclinic
    ChemistryClassification
    Borate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Nifontovite optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: strong fire
    OpticalComments
    RefractiveIndex
    1.575-1.584
    Birefringence
    0.009
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert to weak violet
    LWUV: Inert to weak violet
    CCFReaction
    Pleochroism
    Unobservable
  • Nifontovite characteristic physical properties

    Hardness
    3.5-5
    CharacteristicComments
    Streak
    SpecificGravity
    2.35-2.36
    Toughness
    Poor
    Inclusions
    Luster
    Vitreous
    Stability
    Fracture
    Uneven
    Cleavage
    Poor, in one direction