Taaffeite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Taaffeite

A rare and beautiful mineral, taaffeite is a lilac to mauve, brown to red, bluish green crystal that may be transparent to translucent in appearance. Interestingly enough, this gem was first discovered as a faceted gemstone that was thought to be spinel. Eventually, the mineral was found in Sri Lanka.

Colors

Pink To Red, Blue, Violet, Purple, Brown, Colorless

  • Taaffeite classification

    CommonName
    Taaffeite
    Species
    Taaffeite
    Variety
    Colors
    Pink To Red, Blue, Violet, Purple, Brown, Colorless
    AlternateNames
    GemstoneGroups
    KeySeparations
    RI, birefringence and optic character
    ClassificationComments
  • Taaffeite chemistry & crystallography

    ChemicalName
    magnesium aluminum beryllium oxide
    ChemicalFormula
    MgBeAl4O8
    Synthesis
    CrystalSystem
    Hexagonal
    ChemistryClassification
    Oxide
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Taaffeite optical properties

    Transparency
    Transparent
    Dispersion
    Strength: weak fire Value: 0.019
    OpticalComments
    RefractiveIndex
    1.719-1.723
    Tolerance:(+0.002/-0.002)
    Birefringence
    0.004-0.005
    OpticCharacter
    Uniaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert to weak green
    LWUV: Inert to weak green
    CCFReaction
    Pleochroism
    Unobservable
  • Taaffeite characteristic physical properties

    Hardness
    8-8.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.6-3.62 Typical:3.61
    Toughness
    Good
    Inclusions
    Taaffeite might contain healing cracks, crystal inclusions and natural inclusions
    Luster
    Vitreous
    Stability
    Fracture
    Conchoidal
    Cleavage
    None