Drusy Quartz Gemstone & Information | Gemopedia by JTV | Gemopedia™
The word "drusy," is a mineralogical term used as both a noun and an adjective. The noun refers to a mineral coating of thin layers of tiny, tightly-packed crystals that resemble glittering sugar granules. The adjective refers to any such granulated crystal layers in reference to a given mineral; in this case, drusy quartz. Drusy quartz is usually found in the inside of geodes. When fashioned into loose gemstones and jewelry, it is often coated with a metallic color to capitalize on the glittering natural crystal facets and give it a more bold appearance.
Drusy-quartz classificationCommonNameDrusy QuartzSpeciesQuartzVarietyColorsVarious ColorsAlternateNamesDruse Quartz, Druzy QuartzGemstoneGroupsKeySeparationsAppearance, refractive index, birefringenceClassificationCommentsDrusy or druse is a fine layer of crystals that coat a rock or mineral.
Drusy-quartz chemistry & crystallographyChemicalNamesilicon dioxide (aka silica)ChemicalFormulaSiO2SynthesisCrystalSystemTrigonalChemistryClassificationSilicateNatureNaturalCrystallinityPolycrystallineChemistryComments
Drusy-quartz optical propertiesTransparencyTranslucent - OpaqueDispersionOpticalCommentsRefractiveIndex1.544-1.553
Tolerance:very constantBirefringenceOpticCharacterUniaxialOpticSignPositivePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV:
Drusy-quartz characteristic physical propertiesHardness7CharacteristicCommentsStreakSpecificGravityToughnessVariesInclusionsDrusy quartz is often treated by means of CVD to give a metallic luster and range of colors.LusterVitreousStabilityFairFractureConchoidalCleavageNone