Moonstone-Labradorite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Moonstone-Labradorite

Moonstone is a variety of feldspar that displays an amazing optical phenomenon called, adularescence. Internallyrepeating feldspar layers scatter the light that enters the stone creating a mystical glow reminiscent of moonbeams.This glow comes to life, rolling across the gems surface, when it is moved. Adularescent labradorite with a multi-colored glow is sometimes called Rainbow Moonstone.

Colors

Colorless, White, Slight Orange, Green With Blue Sheen

  • Moonstone-labradorite classification

    CommonName
    Moonstone-Labradorite
    Species
    Labradorite
    Variety
    Moonstone
    Colors
    Colorless, White, Slight Orange, Green With Blue Sheen
    AlternateNames
    Rainbow Moonstone
    GemstoneGroups
    Feldspar
    KeySeparations
    refractive index, fracture, fluorescence and maybe birefringence.
    ClassificationComments
    Moonstone describes a near colorless variety of labradorite feldspar when adularescence in the appearance of a blue sheen is observable.
  • Moonstone-labradorite chemistry & crystallography

    ChemicalName
    calcium, sodium aluminum silicate
    ChemicalFormula
    NaAlSi3O8 and CaAl2Si2O8
    Synthesis
    CrystalSystem
    Triclinic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Moonstone-labradorite optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    OpticalComments
    RefractiveIndex
    1.559-1.568
    Birefringence
    0.009-0.009
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: weak pinkish orange
    LWUV: moderate chalky blue
    CCFReaction
    Pleochroism
    Unobservable
  • Moonstone-labradorite characteristic physical properties

    Hardness
    6-6.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.65-2.75 Range:+/-0.05 Typical:2.69
    Toughness
    Poor
    Inclusions
    Moonstone occasionally contains colorless inclusions and might show parallel multiple twinning planes.
    Luster
    Vitreous
    Stability
    Fracture
    Uneven, Splintery
    Cleavage
    Perfect, in two directions