Diaspore Gemstone & Information | Gemopedia by JTV | Gemopedia™
Diaspore is beautiful and exotic in a soft, subtle manner. It is also one of the lesser known of the color-change gemstones. Some of the finest examples of gem quality diaspore are found in Turkey's Anatolian Mountains, but it can be found in numerous places around the globe. A rising star in fine jewelry, it's easy to fall in love with its sparklingly brilliant, tranquil earthy colors.
White, Pale Gray, Colorless, Greenish Gray, Brown, Pale Yellow, Pink, Lilac
Diaspore classificationCommonNameDiasporeSpeciesDiasporeVarietyColorsWhite, Pale Gray, Colorless, Greenish Gray, Brown, Pale Yellow, Pink, LilacAlternateNamesZultanite(R), CsariteGemstoneGroupsDiasporeKeySeparationsRI and birefringenceClassificationCommentsStrong color change variety sold under the name Zultanite(R)
Diaspore chemistry & crystallographyChemicalNamealuminum oxide hydroxideChemicalFormulaAlO(OH)SynthesisCrystalSystemOrthorhombicChemistryClassificationOxideNatureNaturalCrystallinityCrystallineChemistryComments
Diaspore optical propertiesTransparencyTransparentDispersionStrength: weak fireOpticalCommentsRefractiveIndex1.702-1.75Birefringence0.048OpticCharacterBiaxialOpticSignPositivePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV:
LWUV:CCFReactionPleochroismDichroic, strong reddish violet to reddish brown or green to grayish green
Diaspore characteristic physical propertiesHardness6.5-7CharacteristicCommentsStreakWhiteSpecificGravity3.3-3.39 Range:0.12/-0.18 Typical:3.38ToughnessInclusionsLusterVitreousStabilityFractureConchoidalCleavagePerfect, in one direction, Good, in one direction