Amazonite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Amazonite

Blue-green specimens of microline are called amazon stone or amazonite, named for its supposed discovery location near the Amazon River. Amazonite that is used in jewelry is generally cut into cabochons. Gem-quality amazonite is found in the Ilmen and Ural Mountains of Russia, the Pikes Peak district of Colorado and in Minas Gerais, Brazil.

Colors

Light Green To Greenish Blue

  • Amazonite classification

    CommonName
    Amazonite
    Species
    Microcline
    Variety
    Amazonite
    Colors
    Light Green To Greenish Blue
    AlternateNames
    Amazon Stone
    GemstoneGroups
    Feldspar
    KeySeparations
    appearance, RI, magnification, SG, possible fluorescence
    ClassificationComments
    Misnomers: Colorado jade, Pike's Peak jade
  • Amazonite chemistry & crystallography

    ChemicalName
    potassium aluminum silicate
    ChemicalFormula
    KAlSi3O8
    Synthesis
    CrystalSystem
    Triclinic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Aggregate
    ChemistryComments
  • Amazonite optical properties

    Transparency
    Semitranslucent - Opaque
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    1.522-1.53
    Tolerance:(+0.004/-0.004)
    Birefringence
    0.008
    OpticCharacter
    Biaxial
    OpticSign
    Negative
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV: Inert
    LWUV: Inert to weak yellowish green
    CCFReaction
    Pleochroism
    None
  • Amazonite characteristic physical properties

    Hardness
    6-6.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.54-2.58 Typical:2.56
    Toughness
    Poor
    Inclusions
    Amazonite has mottled coloring with grid like white streaks or patterns caused by cleavage.
    Luster
    Vitreous
    Stability
    Fracture
    Uneven, Splintery
    Cleavage
    Perfect, in two directions