Lapis Lazuli Gemstone & Information | Gemopedia by JTV | Gemopedia™

Lapis Lazuli

Discover the mystical allure of rich, royal blue and sparkling golden specks found in lapis lazuli. Very few gems have such a long and storied history as lapis lazuli. Along with carnelian, it is the oldest known gemstones to be appreciated and worn as adornment. When lapis lazuli was first introduced to Europe, it was called ultramarine, meaning "beyond the sea." The gem was ground to a powder for use as early eye shadow, and as pigment for early oil paints. Today, this rich blue gem still retains the allure that first captivated humans thousands of years ago.

Colors

Medium To Dark, Slightly Greenish Blue To Violetish Blue

  • Lapis-lazuli classification

    CommonName
    Lapis Lazuli
    Species
    NA
    Variety
    Colors
    Medium To Dark, Slightly Greenish Blue To Violetish Blue
    AlternateNames
    Lapis
    GemstoneGroups
    KeySeparations
    Apperance, RI, magnification and possibly fluorescence
    ClassificationComments
    Some areas of the stone might have a RI of 1.67 due to calcite inclusions. Lapis lazuli is a mixture of lazurite, calcite and pyrite.
  • Lapis-lazuli chemistry & crystallography

    ChemicalName
    sodium calcium aluminum silicate
    ChemicalFormula
    (Na,Ca)8[(SiO4,S,Cl)2I(AlSi)4]6
    Synthesis
    CrystalSystem
    NA
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Polycrystalline
    ChemistryComments
  • Lapis-lazuli optical properties

    Transparency
    Semitranslucent - Opaque
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    1.5
    Birefringence
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV: weak to moderate green to yellowish green
    LWUV: Inert
    CCFReaction
    dull reddish brown
    Pleochroism
    None
  • Lapis-lazuli characteristic physical properties

    Hardness
    5-6
    CharacteristicComments
    Streak
    White To Light Blue
    SpecificGravity
    2.25-3 Typical:2.75
    Toughness
    Fair
    Inclusions
    Lapis lazuli commonly contains pyrite and white calcite. The pyrite inclusions in natural stones are randomly scattered throughout the stone and have irregular outlines that are surrounded by darker blue rings.
    Luster
    Vitreous
    Stability
    Fracture
    Granular, Uneven
    Cleavage
    None