Tugtupite Gemstone & Information | Gemopedia by JTV | Gemopedia™
Tugtupite gets its unique name from the location of its discovery in southwest Greenland. This semi-transparent to opaque mineral species is usually pink to red and often mottled with white, gray or black. Nicknamed the "Reindeer Stone," tugtupite is tenebrescent; when stored in darkness, the gem's color will fade, but returns immediately upon exposure to daylight. Among collectors, tugtupite is also prized for its luminescent properties: strong fluorescence and less commonly, phosphorescence, when the gem continues to fluoresce even after the ultraviolet light source has been removed.
Usually Pink To Red, Often Mottled With White, Gray, Black; Rarely Light Blue
Tugtupite classificationCommonNameTugtupiteSpeciesTugtupiteVarietyColorsUsually Pink To Red, Often Mottled With White, Gray, Black; Rarely Light BlueAlternateNamesReindeer StoneGemstoneGroupsKeySeparationsappearance, RI, SG and fluorescenceClassificationCommentsMisnomer: beryllium sodalite. Piezoelectric: development of opposite charges at the ends of a tourmaline crystal when placed under stress.
Tugtupite chemistry & crystallographyChemicalNameChemicalFormulaNa4AlBeSi4O12ClSynthesisCrystalSystemTetragonalChemistryClassificationSilicateNatureNaturalCrystallinityCrystalline to AggregateChemistryComments
Tugtupite optical propertiesTransparencyTranslucent - OpaqueDispersionOpticalCommentsRefractiveIndex1.496-1.502Birefringence0.006OpticCharacterUniaxialOpticSignPositivePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV: Inert to moderate orange-red
LWUV: moderate to strong orange-redCCFReactionPleochroismDichroic, moderate purplish red and orange-red
Tugtupite characteristic physical propertiesHardness4-6.5CharacteristicCommentsStreakSpecificGravity2.3-2.58 Typical:2.36ToughnessGoodInclusionsLusterVitreousStabilityFractureConchoidal, UnevenCleavageNone