Beryl Gemstone & Information | Gemopedia by JTV | Gemopedia™
The name beryl is derived from the ancient Greek term for the same gem, beryllos; also the etymology for the element beryllium that is part of its chemistry. Some scholars believe the word beryl is related to the ancient trading city of Belur or perhaps has ancient Indian origins (being derived from the old Hindi word velurya or the Sanskrit word vaidurya). Varieties include emerald, bixbite (red beryl), morganite, aquamarine, heliodor (golden beryl) and goshenite.
Colorless, Green, Yellow, Light Orange, Pink, Red, Blue, Brown, Black
Beryl classificationCommonNameBerylSpeciesBerylVarietyColorsColorless, Green, Yellow, Light Orange, Pink, Red, Blue, Brown, BlackAlternateNamesGemstoneGroupsKeySeparationsrefractive index, birefringence, optic characterClassificationCommentsVarieties include emerald (green), aquamarine (blue to green), heliodor (yellow), morganite (pink), goshenite (colorless), brown and black beryls. Some varieties may also show optical phenomena such as chatoyancy or asterism.
Beryl chemistry & crystallographyChemicalNameberyllium aluminum silicateChemicalFormulaBe3Al2(SiO3)6SynthesisCrystalSystemHexagonalChemistryClassificationSilicateNatureNaturalCrystallinityCrystallineChemistryComments
Beryl optical propertiesTransparencyTransparent - OpaqueDispersionStrength: weak fire Value: 0.014OpticalCommentsRefractiveIndex1.577-1.583
Tolerance:(+0.017/-0.017)Birefringence0.005-0.009OpticCharacterUniaxialOpticSignNegativePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV: Inert
LWUV: InertCCFReactionPleochroismVaries based on color
Beryl characteristic physical propertiesHardness7.5CharacteristicCommentsStreakWhiteSpecificGravity2.67-2.9 Range:0.18/-0.05 Typical:2.72ToughnessGoodInclusionsAll beryl are type I stones with the exception of emerald and bixbite which are Type III clarity stones. Stone might have liquid and fingerprint inclusions, 2-phase or 3-phase inclusions, tubular inclusions and needles.LusterVitreousStabilityGoodFractureConchoidalCleavagePoor, in one direction