Axinite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Axinite

Axinite is an uncommon mineral that usually occurs in long, flat, axe-shaped crystals, a trait that makes it highly desirable to collectors who enjoy adding various crystal forms to their collections. Its strong trichroism only adds to its special appeal. As it is rotated, different colors are displayed, including rich cinnamon browns, violets, blues or greens.

Colors

Brown, Purplish Brown, Brownish Yellow, Violet, Blue

  • Axinite classification

    CommonName
    Axinite
    Species
    Axinite
    Variety
    Colors
    Brown, Purplish Brown, Brownish Yellow, Violet, Blue
    AlternateNames
    GemstoneGroups
    KeySeparations
    RI, optic sign, pleochroism, spectrum
    ClassificationComments
  • Axinite chemistry & crystallography

    ChemicalName
    calcium aluminum boron sorosilicate hydroxide
    ChemicalFormula
    (Ca,Fe,Mn,Mg)3Al2BSi4O15(OH)
    Synthesis
    CrystalSystem
    Triclinic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Axinite optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    OpticalComments
    RefractiveIndex
    1.678-1.688
    Tolerance:(+0.005/-0.005)
    Birefringence
    0.01-0.012
    OpticCharacter
    Biaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    Trichroic, strong violetish purple, light yellow and red-brown
  • Axinite characteristic physical properties

    Hardness
    6.5-7
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.26-3.36 Typical:3.29
    Toughness
    Varies
    Inclusions
    Many stones are included some with goethite fibrous.
    Luster
    Vitreous
    Stability
    Poor
    Fracture
    Conchoidal, Uneven
    Cleavage
    Good, in one direction