Antigorite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Antigorite

Antigorite is a hard, compact variety of serpentine occurring either in corrugated plates or fibers. Serpentine is well known to mineralogists and gemologists, but is much less familiar to the general public. Often similar to jade in appearance, it is primarily used an ornamental material and has been carved into a wide array of decorative objects throughout history. Antigorite is usually green, but may be yellowish, gray, brown or black.

Colors

Dark Green, Blue-Green, Yellowish, Gray, Brown, Black

  • Antigorite classification

    CommonName
    Antigorite
    Species
    Antigorite
    Variety
    Colors
    Dark Green, Blue-Green, Yellowish, Gray, Brown, Black
    AlternateNames
    GemstoneGroups
    Serpentine
    KeySeparations
    RI, magnification, spectrum, appearance and surface condition.
    ClassificationComments
    Antigorite is a hard compact variety of serpantine that occurs in pleated masses.
  • Antigorite chemistry & crystallography

    ChemicalName
    hydrous magnesium iron phyllosilicate
    ChemicalFormula
    (Mg)3Si2O5(OH)4
    Synthesis
    CrystalSystem
    Monoclinic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Microcrystalline
    ChemistryComments
  • Antigorite optical properties

    Transparency
    Semitransparent - Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    1.557-1.571
    Birefringence
    OpticCharacter
    Biaxial
    OpticSign
    Negative
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV:
    LWUV:
    CCFReaction
    Pleochroism
    Unobservable
  • Antigorite characteristic physical properties

    Hardness
    2.5-3.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.58-2.61
    Toughness
    Poor
    Inclusions
    Antigorite often shows scratches and poor polish due to low mohs hardness. Stones are fine grained and has a flaky structure.
    Luster
    Waxy
    Stability
    Fracture
    Granular, Uneven
    Cleavage
    Perfect, in one direction