Nephrite Jade Gemstone & Information | Gemopedia by JTV | Gemopedia™
Jade has been treasured for some 7,000 years for its unique luster, lovely color and impeccable toughness. This precious gem has always had special significance in many Asian cultures, and can be compared to the West's admiration of diamonds and gold. For centuries, nephrite jade and jadeite were considered one and the same. It was not until 1863 that they were identified as different minerals with a similar appearance and properties.
Light To Dark Grayish Green, Light To Dark Yellow To Brown, White, Light To Dark Gray, Black; Often Mottled; Light To Dark Pinkish Lavender If Dyed
Nephrite-jade classificationCommonNameNephrite JadeSpeciesNephriteVarietyColorsLight To Dark Grayish Green, Light To Dark Yellow To Brown, White, Light To Dark Gray, Black; Often Mottled; Light To Dark Pinkish Lavender If DyedAlternateNamesNew Zealand Greenstone, New Zealand Jade, Mutton Fat, Chicken Bone, Tomb Jade Or Grave Jade, Polar JadeGemstoneGroupsKeySeparationsappearance, RI and SG. Scratch test can be used but is destructive.ClassificationCommentsCommonly has a 1.61 spot reading. New Zealand greenstone, New Zealand jade or spinach jade: dark grayish greenMutton fat: translucent white to very light yellowChicken bone: opaque white to very light brown or grayTomb or grave jade: ancient burial pieces with surface material altered to a brown or a white chalky looking texture. Polar jade: bright green
Nephrite-jade chemistry & crystallographyChemicalNamecalcium magnesium or iron silicateChemicalFormulaCa2(Mg,Fe)5Si8O22(OH)2SynthesisCrystalSystemMonoclinicChemistryClassificationSilicateNatureNaturalCrystallinityPolycrystallineChemistryComments
Nephrite-jade optical propertiesTransparencyTranslucent - OpaqueDispersionStrength: noneOpticalCommentsRefractiveIndex1.606-1.632
Tolerance:(+0.009/-0.006)BirefringenceOpticCharacterOpticSignPolariscopeReactionAggregate (AGG)FluorescenceSWUV: Inert
Nephrite-jade characteristic physical propertiesHardness6-6.5CharacteristicCommentsStreakWhiteSpecificGravity2.9-3.1 Typical:2.95ToughnessExcellentInclusionsStone may have black inclusions. If the stone is dyed it might show color concentrations.LusterVitreousStabilityGoodFractureSplintery, GranularCleavageNone