Star Diopside Gemstone & Information | Gemopedia by JTV | Gemopedia™
Star diopside exhibits the optical phenomenon called asterism, a star-like pattern created on the surface of a gemstone when light encounters parallel fibrous, or needle-like, inclusions within its crystal structure. Light that strikes the inclusions within the gem reflects off of the inclusions, creating a narrow band of light. When two or more intersecting bands appear, a star pattern is formed. Depending on the crystal, the star may have four, six, or even twelve rays. When only one band forms, it is classified as a "cat's eye."
Dark Green To Black
Star-diopside classificationCommonNameStar DiopsideSpeciesDiopsideVarietyStar DiopsideColorsDark Green To BlackAlternateNamesGemstoneGroupsKeySeparations4 rayed star, RI, spectrum and might show birefringence blinkClassificationCommentsSix rayed stars are possible but rare.
Star-diopside chemistry & crystallographyChemicalNamecalcium magnesium silicateChemicalFormulaCaMgSi2O6SynthesisCrystalSystemMonoclinicChemistryClassificationSilicateNatureNaturalCrystallinityCrystallineChemistryComments
Star-diopside optical propertiesTransparencySemitranslucent - OpaqueDispersionStrength: moderate fire Value: 0.02OpticalCommentsRefractiveIndex1.675-1.701
Tolerance:(+0.029/-1.701)Birefringence0.024-0.03OpticCharacterBiaxialOpticSignPositivePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV: Inert
Star-diopside characteristic physical propertiesHardness5.5-6CharacteristicCommentsStreakWhiteSpecificGravity3.22-3.4 Typical:3.29ToughnessPoorInclusionsBlack needle-like magnetite inclusions that might be magnetic, metallic like inclusions and liquid inclusions.LusterVitreousStabilityFairFractureConchoidal, UnevenCleavageGood, in two directions