Hessonite Garnet Gemstone & Information | Gemopedia by JTV | Gemopedia™
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.
Medium To Dark Orange To Brownish Orange
Hessonite-garnet classificationCommonNameHessonite GarnetSpeciesGrossulariteVarietyHessoniteColorsMedium To Dark Orange To Brownish OrangeAlternateNamesEssonite, Cinnamon Stone, Hyacinth Or JacinthGemstoneGroupsGarnetKeySeparationsRI, SR nature and magnificationClassificationCommentsUsually shows stubby, rounded included crystals and "heat wave" or "scotch-in-water" effect.
Hessonite-garnet chemistry & crystallographyChemicalNameCalcium aluminum silicateChemicalFormulaCa3Al2(SiO4)3SynthesisCrystalSystemCubicChemistryClassificationSilicateNatureNaturalCrystallinityCrystallineChemistryComments
Hessonite-garnet optical propertiesTransparencyTransparent - SemitransparentDispersionValue: 0.028OpticalCommentsRefractiveIndex1.74-1.74
Tolerance:(+0.020/-0.010)BirefringenceOpticCharacterNAOpticSignNAPolariscopeReactionSingly Refractive (SR)FluorescenceSWUV: Inert to weak orange
LWUV: Inert to weak orange, pink or redCCFReactionPleochroismNone
Hessonite-garnet characteristic physical propertiesHardness7-7.5CharacteristicCommentsStreakSpecificGravity3.57-3.73 Range:0.12/-0.04 Typical:3.61ToughnessGoodInclusionsStubby, rounded included crystals. Shows oily, "heat wave" or "scotch in water" effect.LusterVitreousStabilityGoodFractureConchoidal, UnevenCleavageNone