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

Andesine-Labradorite

Andesine-Labradorite is a beautiful crystalline gem that is a combination of two feldspar varieties: andesine and labradorite. Its name "andesine" refers to the Andes Mountains where andesine was first found and the name "labradorite" was derived from Labrador, Canada, where labradorite was first discovered. So why the hyphenated name? Chemically speaking, our material falls between andesine and labradorite, so we chose to hyphenate and use both terms to be more accurate and descriptive.

Colors

Red, Orange, Yellow, Green

  • Andesine-labradorite classification

    CommonName
    Andesine-Labradorite
    Species
    Andesine-Labradorite
    Variety
    Colors
    Red, Orange, Yellow, Green
    AlternateNames
    GemstoneGroups
    Feldspar
    KeySeparations
    RI, birefringence
    ClassificationComments
    Red and green andesine-labradorite is produced by adding copper to the otherwise pale yellow feldspar gem through a treatment called diffusion.
  • Andesine-labradorite chemistry & crystallography

    ChemicalName
    calcium or sodium silicate
    ChemicalFormula
    NaAlSi3O8 or CaAl2Si2O8
    Synthesis
    CrystalSystem
    Triclinic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Andesine-labradorite optical properties

    Transparency
    Transparent - Semitranslucent
    Dispersion
    OpticalComments
    RefractiveIndex
    1.558-1.57
    Birefringence
    0.009
    OpticCharacter
    Biaxial
    OpticSign
    Positive or Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV:
    LWUV:
    CCFReaction
    Pleochroism
    None
  • Andesine-labradorite characteristic physical properties

    Hardness
    6-6.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.64-2.74
    Toughness
    Poor
    Inclusions
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Cleavage
    Perfect, in two directions