Hessonite Garnet Gemstone & Information | Gemopedia by JTV | Gemopedia™

Hessonite Garnet

Nicknamed the "cinnamon stone", hessonite is a variety of grossular garnet and comes in two colors, golden and cinnamon. A perfectly colored hessonite is a bright golden orange that resembles a combination of honey and orange with an internal fire. Some hessonites have tints of red and brown with cinnamon appearance. Hessonite is common in the gem gravels of Sri Lanka and practically all hessonite is obtained from this locality, although it is also found in Africa. While the clearest gems are most prized, inclusions in hessonite are common, with unique toffee-like streaks giving hessonite an oily or even glass-like appearance.

Colors

Medium To Dark Orange To Brownish Orange

  • Hessonite-garnet classification

    CommonName
    Hessonite Garnet
    Species
    Grossularite
    Variety
    Hessonite
    Colors
    Medium To Dark Orange To Brownish Orange
    AlternateNames
    Essonite, Cinnamon Stone, Hyacinth Or Jacinth
    GemstoneGroups
    Garnet
    KeySeparations
    RI, SR nature and magnification
    ClassificationComments
    Usually shows stubby, rounded included crystals and "heat wave" or "scotch-in-water" effect.
  • Hessonite-garnet chemistry & crystallography

    ChemicalName
    Calcium aluminum silicate
    ChemicalFormula
    Ca3Al2(SiO4)3
    Synthesis
    CrystalSystem
    Cubic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Hessonite-garnet optical properties

    Transparency
    Transparent - Semitransparent
    Dispersion
    Value: 0.028
    OpticalComments
    RefractiveIndex
    1.74-1.74
    Tolerance:(+0.020/-0.010)
    Birefringence
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Singly Refractive (SR)
    Fluorescence
    SWUV: Inert to weak orange
    LWUV: Inert to weak orange, pink or red
    CCFReaction
    Pleochroism
    None
  • Hessonite-garnet characteristic physical properties

    Hardness
    7-7.5
    CharacteristicComments
    Streak
    SpecificGravity
    3.57-3.73 Range:0.12/-0.04 Typical:3.61
    Toughness
    Good
    Inclusions
    Stubby, rounded included crystals. Shows oily, "heat wave" or "scotch in water" effect.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal, Uneven
    Cleavage
    None