Sinhalite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Sinhalite

Sinhalite is named after its discovery location, Sri Lanka, using its Sanskrit name, Sinhala. This rare gemstone was, until recently, only found in Sri Lanka, but is now mined in Tanzania, Madagascar and Burma. Often occurring in green to brown to brownish black hues, it was once mistakenly believed to be a variety of olivine.

Colors

Greenish To Brownish Yellow, Brown, Rarely Light Pink

  • Sinhalite classification

    CommonName
    Sinhalite
    Species
    Sinhalite
    Variety
    Colors
    Greenish To Brownish Yellow, Brown, Rarely Light Pink
    AlternateNames
    GemstoneGroups
    KeySeparations
    RI, birefringence, optic character and spectrum
    ClassificationComments
    Misnomer: brown peridot
  • Sinhalite chemistry & crystallography

    ChemicalName
    magnesium aluminum iron borate
    ChemicalFormula
    MgAlBO4
    Synthesis
    CrystalSystem
    Orthorhombic
    ChemistryClassification
    Borate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Sinhalite optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: moderate fire Value: 0.017
    OpticalComments
    RefractiveIndex
    1.668-1.707
    Tolerance:(+0.005/-0.003)
    Birefringence
    0.036-0.039
    OpticCharacter
    Biaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    Trichroic, moderate to strong light brown, dark brown, and greenish brown
  • Sinhalite characteristic physical properties

    Hardness
    6.5-7
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.46-3.5 Typical:3.48
    Toughness
    Good
    Inclusions
    Sinhalite might have natural inclusions, sillimanite needles and can show iron staining.
    Luster
    Vitreous
    Stability
    Fracture
    Conchoidal
    Cleavage
    None