Glass Gemstone & Information | Gemopedia by JTV | Gemopedia™
Glass has been used for thousands of years as a decoration. It is sometimes employed as a gemstone simulant, but is often appreciated entirely upon its own merits, especially when formed with a high level of artistry.
Glass classificationCommonNameGlassSpeciesNAVarietyColorsAll ColorsAlternateNamesPaste, Strass, FaienceGemstoneGroupsKeySeparationsRI, magnification and warm to touch.ClassificationComments
Glass chemistry & crystallographyChemicalNamesilicaChemicalFormulaSynthesisCrystalSystemNAChemistryClassificationNatureSimulantCrystallinityNon-CrystallineChemistryComments
Glass optical propertiesTransparencyTransparent - OpaqueDispersionStrength: moderate if contains lead Value: 0.00901OpticalCommentsRefractiveIndex1.47-1.7
Tolerance:can go OTLBirefringenceOpticCharacterNAOpticSignNAPolariscopeReactionAggregate (AGG)FluorescenceSWUV: Variable
Glass characteristic physical propertiesHardness5-6CharacteristicCommentsStreakSpecificGravity2.3-4.5ToughnessPoorInclusionsSince glass has a low mohs hardness and is usually molded the stones will have mold marks, rounded facet edges, concave facets. It will also sometimes show orange peel effect or a bumpy surface that resembles an orange peel. Glass will often show cavities on the surface of the stone and swirl lines and glass bubbles internally.LusterVitreousStabilityFractureConchoidal, Granular, SplinteryCleavageNone