Trapiche Emerald Gemstone & Information | Gemopedia by JTV | Gemopedia™
Trapiche emeralds hail exclusively from the emerald mines in the Boyac region of Colombia, and are so named because their patterns resemble the spoked wheels of the heavy gear locals use to grind sugar cane. Extremely limited in supply, trapiche emeralds are perhaps the rarest of all "pattern" gemstones. Their six distinct "spokes" are caused by the presence of the mineral inclusion lutite. As the hexagonal emerald crystal grew, it pushed the lutite towards the center of the crystal and then radiated out in the six directions of the emerald crystal. A truly remarkable feat, compliments of Mother Nature!
Light To Very Dark Green To Strongly Bluish Green, Slightly Yellowish Green
Trapiche-emerald classificationCommonNameTrapiche EmeraldSpeciesBerylVarietyTrapiche EmeraldColorsLight To Very Dark Green To Strongly Bluish Green, Slightly Yellowish GreenAlternateNamesGemstoneGroupsBerylKeySeparationsAppearance and spot RI. Stones usually have a spot reading between 1.56 to 1.57.ClassificationComments
Trapiche-emerald chemistry & crystallographyChemicalNameberyllium aluminum silicateChemicalFormulaBe3Al2(SiO3)6SynthesisCrystalSystemHexagonalChemistryClassificationSilicateNatureNaturalCrystallinityCrystallineChemistryComments
Trapiche-emerald optical propertiesTransparencyTransparent - TranslucentDispersionStrength: weak fire Value: 0.014OpticalCommentsRefractiveIndex1.56-1.57Birefringence0.006-0.007OpticCharacterNAOpticSignPolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV: Inert
LWUV: InertCCFReactionPleochroismDichroic, weak to moderate, varying shades of body color
Trapiche-emerald characteristic physical propertiesHardness7.5CharacteristicCommentsStreakWhiteSpecificGravity2.68-2.71ToughnessPoorInclusionsSix green arms or spoked pattern radiating from the core viewed down the length of the crystal due to carbon-containing inclusions.LusterVitreousStabilityFairFractureConchoidalCleavageNone