Zincite Gemstone & Information | Gemopedia by JTV | Gemopedia™
The majority of gem-quality zincite in the market is the byproduct of Polish metal refineries where the material crystallized in the factory smokestacks and was then harvested during cleaning. Zincite can also be found naturally in a few localities, most notably associated with metamorphosed zinc ore bodies in Sterling, New Jersey, though the crystals are rarely of gem quality.
Medium To Pale Yellow, Medium Orange, Medium To Dark Reddish-Orange, Red, Green
Zincite classificationCommonNameZinciteSpeciesZinciteVarietyColorsMedium To Pale Yellow, Medium Orange, Medium To Dark Reddish-Orange, Red, GreenAlternateNamesRed-Zinc OreGemstoneGroupsKeySeparationsOTL RI, DR nature and SGClassificationCommentsNatural stones or specimens come from mines in New Jersey. There are some man made stones that come from Poland and are a byproduct of zinc metal extraction from ore.
Zincite chemistry & crystallographyChemicalNamezinc manganese oxideChemicalFormula(Zn,Mn2+)OSynthesisCrystalSystemHexagonalChemistryClassificationOxideNatureNaturalCrystallinityCrystalline to AggregateChemistryComments
Zincite optical propertiesTransparencyTransparent - OpaqueDispersionStrength: weak fire Value: 0.127OpticalCommentsRefractiveIndexOver the Limit 2.013-2.029Birefringence0.016OpticCharacterUniaxialOpticSignPositivePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV: Inert to moderate yellow to orange or yellow-green
LWUV: Inert to moderate yellow to yellow-orangeCCFReactionYellow: Inert to yellowish-green; Orange stone: weak pink; Reddish-orange: moderate redPleochroismUnobservable
Zincite characteristic physical propertiesHardness4CharacteristicCommentsStreakOrange-YellowSpecificGravity5.5-5.9ToughnessPoorInclusionsLusterSubAdamantineStabilityFractureSubconchoidalCleavagePerfect, in one direction