Larimar (pectolite) Gemstone & Information | Gemopedia by JTV | Gemopedia™

Larimar (pectolite)

Larimar is a rare blue to green variety of pectolite, a mineral prized mainly by specimen collectors. While pectolite may be found in several locations, including Canada, England and the U.S., larimar is found only in the Dominican Republic. This unique blue gem formed as a result of volcanic activity millions of years ago that created the Caribbean island of Hispaola. The most prized larimar exhibits sky blue color with a white pattern throughout, quite similar to the look of sunlight dancing on the floor of a pool. This gem was named by its discoverer for both his daughter, Larissa, and el mar, the sea.

Colors

Blue Mottled With White

  • Larimar-pectolite classification

    CommonName
    Larimar (pectolite)
    Species
    Pectolite
    Variety
    Larimar
    Colors
    Blue Mottled With White
    AlternateNames
    GemstoneGroups
    KeySeparations
    Appearance, RI and SG. Sometimes magnification and fluorescence might be helpful.
    ClassificationComments
  • Larimar-pectolite chemistry & crystallography

    ChemicalName
    ChemicalFormula
    NaCa2Si3O8(OH)
    Synthesis
    CrystalSystem
    Triclinic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Larimar-pectolite optical properties

    Transparency
    Semitransparent - Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    1.599-1.628
    Tolerance:(+0.017/-0.004)
    Birefringence
    0.029-0.038
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert to strong greenish yellow or orange
    LWUV: Inert to moderate greenish yellow or orange
    CCFReaction
    Pleochroism
    None
  • Larimar-pectolite characteristic physical properties

    Hardness
    4.5-5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.74-2.9 Typical:2.81
    Toughness
    Varies
    Inclusions
    Under magnification larimar has tiny spheres that have blue center and white outer edge.
    Luster
    Vitreous
    Stability
    Fracture
    Uneven, Splintery
    Cleavage
    Perfect, in two directions