Gilson Imitation Lapis Gemstone & Information | Gemopedia by JTV | Gemopedia™

Gilson Imitation Lapis

Gilson imitation lapis is a man-made lapis simulant that gives the look of the widely appreciated natural gemstone lapis lazuli. Because this imitation jewel has some ingredients and physical properties not shared with natural lapis, it is considered a simulant, as opposed to synthetic stone.

Colors

Intense Medium To Dark Blue To Violet Blue

  • Gilson-imitation-lapis classification

    CommonName
    Gilson Imitation Lapis
    Species
    NA
    Variety
    Colors
    Intense Medium To Dark Blue To Violet Blue
    AlternateNames
    GemstoneGroups
    KeySeparations
    Appearance, RI, magnification and SG. Due to the porous nature the SG will change after the stone is soaked in water
    ClassificationComments
    Misnomer: synthetic lapis lazuli
  • Gilson-imitation-lapis chemistry & crystallography

    ChemicalName
    ChemicalFormula
    Synthesis
    CrystalSystem
    NA
    ChemistryClassification
    Nature
    Simulant
    Crystallinity
    ChemistryComments
  • Gilson-imitation-lapis optical properties

    Transparency
    Opaque
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    1.53-1.55
    Birefringence
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Fluorescence
    SWUV: inert
    LWUV: inert
    CCFReaction
    Pleochroism
    None
  • Gilson-imitation-lapis characteristic physical properties

    Hardness
    3
    CharacteristicComments
    Streak
    Strong Blue
    SpecificGravity
    2.33-2.53
    Toughness
    Fair
    Inclusions
    Gilson imitation lapis will have vibrant and even coloration. Small amounts of minute pyrite particles will be evenly distributed throughout the stone. Surface of the stone might show many small angular, dark violet patches in reflected light. Pyrite inclusions will not have dark blue ring surrounding the inclusion.
    Luster
    Vitreous
    Stability
    Fracture
    Granular, Uneven
    Cleavage
    None