Lazulite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Lazulite

This mineral species can be opaque to crystalline transparent. The color of lazulite ranges from medium to dark greenish blue to violet blue and is often mottled with white. When fashioned into gems, finished stones typically weigh less than 5 carats. A separate mineral species, lazulite should not be confused with lazurite or azurite.

Colors

Medium To Dark Greenish Blue To Violet Blue Sometimes Mottled With White

  • Lazulite classification

    CommonName
    Lazulite
    Species
    Lazulite
    Variety
    Colors
    Medium To Dark Greenish Blue To Violet Blue Sometimes Mottled With White
    AlternateNames
    Bluespar
    GemstoneGroups
    KeySeparations
    RI, birefringence and optic character
    ClassificationComments
  • Lazulite chemistry & crystallography

    ChemicalName
    basic magnesium aluminum phosphate
    ChemicalFormula
    MgAl2(PO4)2(OH)2
    Synthesis
    CrystalSystem
    Monoclinic
    ChemistryClassification
    Phosphate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Lazulite optical properties

    Transparency
    Transparent - Opaque
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    1.612-1.643
    Tolerance:(+0.005/-0.005)
    Birefringence
    0.031
    OpticCharacter
    Biaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: inert
    LWUV: inert
    CCFReaction
    Pleochroism
    Trichroic, strong dark violetish blue, colorless, and light blue
  • Lazulite characteristic physical properties

    Hardness
    5-6
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.08-3.17 Typical:3.09
    Toughness
    Poor
    Inclusions
    Transparent material is highly included. Aggregate lazulite material will have a mottled appearance with white areas.
    Luster
    Vitreous
    Stability
    Fracture
    Granular, Uneven
    Cleavage
    Good, in one direction, Poor, in one direction