Amblygonite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Amblygonite

Amblygonite is quite possibly one of the most beautiful pastel colored gemstones that you may have never heard about. It belongs to a class of minerals known as phosphates and forms a solid-solution series with montebrasite. Industrial grade amblygonite isn't that rare; however, when it comes to facet grade material, it quickly moves up on the hard-to-find list. Colors for amblygonite include pale yellow to greenish yellow and various shades of green to blue. On rare occasions, pink to light purple specimens may be found. Colorless material also is available.

Colors

Colorless, Straw Yellow, Yellow, Lemon Yellow, Greenish Yellow, Light Green, Green, Light Pink, Blue, Brown

  • Amblygonite classification

    CommonName
    Amblygonite
    Species
    Amblygonite
    Variety
    Colors
    Colorless, Straw Yellow, Yellow, Lemon Yellow, Greenish Yellow, Light Green, Green, Light Pink, Blue, Brown
    AlternateNames
    GemstoneGroups
    KeySeparations
    RI, birefringence, optic character, SG, fluorescence.
    ClassificationComments
  • Amblygonite chemistry & crystallography

    ChemicalName
    lithium aluminum phosphate fluoride hydroxide
    ChemicalFormula
    (Li,Na)Al(PO4)(F,OH)
    Synthesis
    CrystalSystem
    Triclinic
    ChemistryClassification
    Phosphate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Amblygonite optical properties

    Transparency
    Transparent
    Dispersion
    Strength: weak fire Value: 0.014
    OpticalComments
    RefractiveIndex
    1.612-1.636
    Tolerance:-0.034
    Birefringence
    0.02-0.027
    OpticCharacter
    Biaxial
    OpticSign
    Positive or Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert to moderate orange
    LWUV: Inert to moderate yellowish white
    CCFReaction
    Pleochroism
    None
  • Amblygonite characteristic physical properties

    Hardness
    5.5-6
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.06-2.98 Typical:3.02
    Toughness
    Poor
    Inclusions
    Amblygonite might show liquid inclusions has a screen like appearance. Stones might also have a hazy parallel bands along the cleavage planes.
    Luster
    Vitreous
    Stability
    Poor
    Fracture
    Conchoidal
    Cleavage
    Perfect, in one direction, Good in one direction