Jeremejevite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Jeremejevite

Jeremejevite was named for a Russian mineralogist in 1883, but there are rarely any specimens found in Russia today. Recently Namibia has started to produce some mentionable crystals, but in such small amounts the stone is still very rare. Jeremejevite is typically found in pale blue-green, cornflower-blue to yellowish brown hues.

Colors

Blue-Green, Cornflower Blue, Brown, Pale Yellow, Colorless

  • Jeremejevite classification

    CommonName
    Jeremejevite
    Species
    Jeremejevite
    Variety
    Colors
    Blue-Green, Cornflower Blue, Brown, Pale Yellow, Colorless
    AlternateNames
    GemstoneGroups
    KeySeparations
    RI, birefringence and possible optic character.
    ClassificationComments
    Jeremejevite is a composite mineral with a uniaxial hexagonal outer zone and a biaxial monoclinic core.Piezoelectric: development of opposite charges at the ends of the crystal when placed under stress.
  • Jeremejevite chemistry & crystallography

    ChemicalName
    aluminum borate fluoride hydroxide
    ChemicalFormula
    Al6B5O15(F,OH)3
    Synthesis
    CrystalSystem
    Hexagonal
    ChemistryClassification
    Borate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Jeremejevite optical properties

    Transparency
    Transparent
    Dispersion
    OpticalComments
    RefractiveIndex
    1.64-1.651
    Tolerance:(+0.002/-0.001)
    Birefringence
    0.009
    OpticCharacter
    Uniaxial and Biaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    Dichroic, strong blue and near colorless
  • Jeremejevite characteristic physical properties

    Hardness
    6.5-7.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.27-3.31
    Toughness
    Poor
    Inclusions
    Jeremejevite often shows banding or growth related color zoning and occasionally step-like growth zoning that looks like lightning bolts. Stones can have natural inclusions, fingerprints and healing feathers.
    Luster
    Vitreous
    Stability
    Fracture
    Conchoidal
    Cleavage
    None