Glass (Cat's-Eye) Gemstone & Information | Gemopedia by JTV | Gemopedia™
The term cat's eye, or chatoyancy, is used to describe a phenomenal optical property in gemstones, in this case man-made glass. The effect, when present, appears as a bright, narrow slit similar to the pupils in the eyes of your favorite feline. This phenomenon is caused by parallel fibrous or needle-like inclusions that interfere with the passage of light through the crystal, scattering and reflecting light back to the viewer as a thin line. Although in this case the phenomenon is not natural, it offers an affordable alternative to this rare phenomenon seen with some natural gems.
Can Be Any Color
Glass-cats-eye classificationCommonNameGlass (Cat's-Eye)SpeciesNAVarietyColorsCan Be Any ColorAlternateNamesCathaystone, Catseyte, Fiber-EyeGemstoneGroupsKeySeparationsmagnification and apperanceClassificationCommentsCat's-eye glass is made up of bundles of parallel optic fibers.
Glass-cats-eye chemistry & crystallographyChemicalNameSilicaChemicalFormulaSynthesisCrystalSystemNAChemistryClassificationNatureSimulantCrystallinityNon-CrystallineChemistryComments
Glass-cats-eye optical propertiesTransparencySemitranslucent - OpaqueDispersionOpticalCommentsRefractiveIndex1.7-1.47
Tolerance:can be OTLBirefringenceOpticCharacterNAOpticSignNAPolariscopeReactionSingly Refractive (SR) With ADRFluorescenceSWUV: Varible
Glass-cats-eye characteristic physical propertiesHardness5-6CharacteristicCommentsStreakSpecificGravity2.3-4.5ToughnessPoorInclusionsCat's-eye glass will have a honeycomb structure when viewed from the side if the cabochon. Stones might have gas bubbles, swirl marks, flow lines or a reflective base.LusterVitreousStabilityFractureConchoidal, Granular, SplinteryCleavageNone