Heliodor (Golden Beryl) Gemstone & Information | Gemopedia by JTV | Gemopedia™
Displaying characteristic yellow to yellowish greens, heliodor is the most cheerful variety of beryl. Interestingly, as an allochromatic gem, pure beryl is colorless, with traces of different elements responsible for beryl's wide range of colors. Heliodor is named from ancient Greek words meaning "gift from the sun," as it was once believed that heliodor harnessed the power and warmth of the sun and was responsible for the change between day and night.
Yellow, Greenish Yellow To Orangy Yellow
Heliodor-golden-beryl classificationCommonNameHeliodor (Golden Beryl)SpeciesBerylVarietyHeliodorColorsYellow, Greenish Yellow To Orangy YellowAlternateNamesGolden BerylGemstoneGroupsKeySeparationsrefractive index, birefringence, optic character, and possibly magnificationClassificationCommentsRI usually falls closer to the 1.577 range.
Heliodor-golden-beryl chemistry & crystallographyChemicalNameberyllium aluminum silicateChemicalFormulaBe3Al2(SiO3)6SynthesisCrystalSystemHexagonalChemistryClassificationSilicateNatureNaturalCrystallinityCrystallineChemistryComments
Heliodor-golden-beryl optical propertiesTransparencyTransparent - TranslucentDispersionStrength: weak fire Value: 0.014OpticalCommentsRefractiveIndex1.577-1.583
Tolerance:(+0.017/-0.017)Birefringence0.005-0.009OpticCharacterUniaxialOpticSignNegativePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV: Inert
LWUV: InertCCFReactionPleochroismDichroic, weak to moderate, varying shades of body color
Heliodor-golden-beryl characteristic physical propertiesHardness7.5CharacteristicCommentsStreakWhiteSpecificGravity2.67-2.9 Range:0.18/-0.05 Typical:2.72ToughnessGoodInclusionsHeliodor is a type I clarity stone but sometimes contains tubular, liquid or planes of small two-phase inclusions.LusterVitreousStabilityGoodFractureConchoidalCleavagePoor, in one direction