Abalone Shell Gemstone & Information | Gemopedia by JTV | Gemopedia™

Abalone Shell

Abalone shell is a particularly prized type of mother-of-pearl, as it displays iridescence unmatched by any other mollusk. Its bold blues and greens give way to a rainbow of flashes of other colors to create a truly unique display.

Colors

Gray, Pink, Purple

  • Abalone-shell classification

    CommonName
    Abalone Shell
    Species
    NA
    Variety
    Colors
    Gray, Pink, Purple
    AlternateNames
    Paua Shell
    GemstoneGroups
    KeySeparations
    Appearance, RI, birefringence blink and magnification.
    ClassificationComments
  • Abalone-shell chemistry & crystallography

    ChemicalName
    calcium carbonate, conchiolin and water
    ChemicalFormula
    CaCO3 with H2O and other organic materials
    Synthesis
    CrystalSystem
    NA
    ChemistryClassification
    Organic
    Nature
    Natural
    Crystallinity
    Non-Crystalline
    ChemistryComments
  • Abalone-shell optical properties

    Transparency
    Translucent - Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    1.53-1.685
    Birefringence
    0.155
    OpticCharacter
    OpticSign
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV: Variable
    LWUV: Variable
    CCFReaction
    Pleochroism
    None
  • Abalone-shell characteristic physical properties

    Hardness
    3.5
    CharacteristicComments
    Streak
    SpecificGravity
    2.7-2.89 Typical:2.86
    Toughness
    Fair
    Inclusions
    Abalone shell cameos will show concave backs due to structure of the shell. Shells will display iridescence or strong orient and will have parallel growth structure. Abalone shell is darker in color than mother-of-pearl and has a gray backgound.
    Luster
    Greasy
    Stability
    Fracture
    Uneven, Splintery
    Cleavage
    None