Plastic Gemstone & Information | Gemopedia by JTV | Gemopedia™
Plastic is sometimes employed as a gemstone simulant, but can also be appreciated entirely upon its own merits, especially when formed with a high level of artistry. Plastics are typically easy to identify, due to a variety of factors such as specific gravity, gas bubbles, hardness, concave facets, flow lines and marks left from the molding process. While no single property is definitive, a combination of three or four will normally allow you to identify the material.
Variety Of Colors
Plastic classificationCommonNamePlasticSpeciesNAVarietyColorsVariety Of ColorsAlternateNamesLucite, Plexiglas, Celluloid, Bakelite And AcrylicGemstoneGroupsKeySeparationsRI, magnification, SG; Destructive: Acrid smell when hot point test is usedClassificationCommentsMost plastic stones will likely sink in a saturated salt solution. Items will feel warm to the touch when compared to natural gem materials. Plastic is widely used to imitate a variety of materials.
Plastic chemistry & crystallographyChemicalNamepolymerChemicalFormulaSynthesisCrystalSystemNAChemistryClassificationNatureSimulantCrystallinityAmorphousChemistryComments
Plastic optical propertiesTransparencyTransparent - OpaqueDispersionStrength: noneOpticalCommentsRefractiveIndex1.46-1.55BirefringenceOpticCharacterNAOpticSignNAPolariscopeReactionSingly Refractive (SR) With ADRFluorescenceSWUV: Variable
Plastic characteristic physical propertiesHardness1.5-3CharacteristicCommentsStreakSpecificGravity1.05-1.55ToughnessFairInclusionsMold marks, concave facets with a pitted surface that looks like an orange peel. Sometimes flow lines and gas bubbles can be seen.LusterVitreousStabilityFractureConchoidal, UnevenCleavageNone