Aventurine Quartz Gemstone & Information | Gemopedia by JTV | Gemopedia™
Aventurine is a form of quartz, distinguished by its translucent to opaque appearance and the presence of mineral inclusions that give a shimmering or glittery effect termed aventurescence. The phenomenon of aventurescence is caused by small leaf-like or plate-like inclusions, usually mica, distributed throughout the host material. Light striking the surface of these inclusions is reflected back to the viewer, creating an eye-catching sparkle. While customarily green in color, aventurine may also be found in colors ranging from blue, orange, white, yellow, reddish-brown to gray.
Green, Gray, Yellow, Brown
Aventurine-quartz classificationCommonNameAventurine QuartzSpeciesNAVarietyColorsGreen, Gray, Yellow, BrownAlternateNamesAventurineGemstoneGroupsKeySeparationsAppearance, RI and magnification.ClassificationCommentsMisnomer: Indian Jade for green variety. Aventurine quartz is quartzite that shows aventurescence.
Aventurine-quartz chemistry & crystallographyChemicalNamesilicon dioxide (aka silica)ChemicalFormulaSiO2SynthesisCrystalSystemTrigonalChemistryClassificationSilicateNatureNaturalCrystallinityAggregateChemistryComments
Aventurine-quartz optical propertiesTransparencyTranslucent - OpaqueDispersionOpticalCommentsRefractiveIndex1.544-1.553
Tolerance:very constantBirefringence0.009OpticCharacterOpticSignPolariscopeReactionAggregate (AGG)FluorescenceSWUV: Inert to weak grayish green or reddish
LWUV: Inert to weak grayish green or reddishCCFReactionPleochroismNone
Aventurine-quartz characteristic physical propertiesHardness7CharacteristicCommentsStreakWhiteSpecificGravity2.64-2.69 Typical:2.66ToughnessGoodInclusionsAventurine quartz will have green disk-like chrome-mica fuchsite flakes or platlets that can be seen with magnification.LusterVitreousStabilityGoodFractureConchoidal, GranularCleavageNone