Forsterite (Synthetic) Gemstone & Information | Gemopedia by JTV | Gemopedia™

Forsterite (Synthetic)

Synthetic forsterite (a variety of olivine) is produced by a process called the Czochralski method. Material containing the elements that make up the mineral forsterite (magnesium, silicon, and oxygen) are melted in a platinum crucible. A small forsterite crystal (called a seed) that is attached to a rod is then dipped into the melt and slowly pulled away as the crystal grows around the seed. For this reason, the Czochralski method is also known as crystal pulling. Synthetic gems have the same chemical, optical, and physical properties of their natural counterparts, but are a more cost-effective alternative to a natural gem.

Colors

Violet To Bluish Violet

  • Forsterite-synthetic classification

    CommonName
    Forsterite (Synthetic)
    Species
    Forsterite
    Variety
    Colors
    Violet To Bluish Violet
    AlternateNames
    GemstoneGroups
    Olivine
    KeySeparations
    RI, birefringence and possible pleochroism
    ClassificationComments
    Synthetic forsterite is often sold as a tanzanite simulant.
  • Forsterite-synthetic chemistry & crystallography

    ChemicalName
    magnesium silicate
    ChemicalFormula
    Mg2SiO4
    Synthesis
    Czochralski pulled
    CrystalSystem
    Orthorhombic
    ChemistryClassification
    Silicate
    Nature
    Synthetic
    Crystallinity
    Crystalline
    ChemistryComments
  • Forsterite-synthetic optical properties

    Transparency
    Transparent
    Dispersion
    OpticalComments
    RefractiveIndex
    1.635-1.67
    Birefringence
    0.034-0.035
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Weak greenish yellow
    LWUV: Weak chalky orangy yellow
    CCFReaction
    Pleochroism
    Dichroic, strong blue and purplish pink
  • Forsterite-synthetic characteristic physical properties

    Hardness
    6.5-7
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.23-3.24 Typical:3.23
    Toughness
    Inclusions
    Synthetic forsterite sometimes includes gas bubbles, tiny white specks, minute needles
    Luster
    Vitreous
    Stability
    Fracture
    Conchoidal
    Cleavage
    Good, in two directions