Type-C Jade Gemstone & Information | Gemopedia by JTV | Gemopedia™
The term, "type-C jade," refers to the enhancement that a jadeite jade gem has undergone. Inthis case, the jadeite has been bleached to remove unattractive brown staining, then stabilized witha polymer resin, and finally dyed to improve or change its color. When a jadeite gem is bleached and stabilized, but not dyed, it is called "type-B." Untreated jadeite, that may or not have had wax applied to its surface, is called, "type-A."
Almost Any Color
Type-c-jade classificationCommonNameType-C JadeSpeciesJadeiteVarietyDyed, Bleach and Impregnated JadeiteColorsAlmost Any ColorAlternateNamesType-C Jadeite, Type-C Jade, Dyed, Bleach And Impregnated JadeiteGemstoneGroupsKeySeparationsAppearance, RI, spectrum, SG and magnification. The detection of dyes might require advanced lab testing. Scratch test can be used but is destructive.ClassificationCommentsDyed jadeite stones will have a broad band in the red area of the spectrum and natural jadeite colored with chrome will only have 3 lines in the yellow, orange and red.
Type-c-jade chemistry & crystallographyChemicalNamesodium aluminum silicateChemicalFormulaNaAlSi2O6SynthesisCrystalSystemMonoclinicChemistryClassificationSilicateNatureNaturalCrystallinityPolycrystallineChemistryComments
Type-c-jade optical propertiesTransparencySemitransparent - OpaqueDispersionOpticalCommentsRefractiveIndex1.666-1.68
Tolerance:(+0.008/-0.008)BirefringenceOpticCharacterOpticSignPolariscopeReactionSingly Refractive (SR)FluorescenceSWUV: Variable
Type-c-jade characteristic physical propertiesHardness6.5-7CharacteristicCommentsStreakSpecificGravity3.25-3.4 Typical:3.34ToughnessExcellentInclusionsDyed jadeite is usually unevenly colored but sometimes you might be able to see dye concentrations under magnification. Type C jadeite has been bleached with acid to remove staining then dyed and often been impregnated with wax or polymers. Hopefully the dye is apparent in surface reaching cracks. Be careful not to confuse this with the color streaks in natural jadeite. It will show etch boundaries between the individual crystal grains. Advanced lab testing is usually required to detect polymer impregnation.LusterVitreousStabilityGoodFractureSplintery, GranularCleavageNone