Sagenitic Quartz Gemstone & Information | Gemopedia by JTV | Gemopedia™
The term "sagenitic" is applied to quartz that contains a radiating mass of needle-like crystal inclusions of other minerals. Such minerals are commonly rutile, tourmaline, actinolite or goethite. While gemstones are usually prized for having no inclusions, sagenitic quartz specimens are treasured for their artistic, one-of-a-kind beauty, which make a beautiful display in a gem collection or jewelry pieces.
Colorless Quartz With Various Colored Inclusions
Sagenitic-quartz classificationCommonNameSagenitic QuartzSpeciesQuartzVarietySagenitic QuartzColorsColorless Quartz With Various Colored InclusionsAlternateNamesSagenite, Cupid's Darts, Fleches D'amour, Venus Hair Stone, Thetis Hair Stone And Cat's Fur QuartzGemstoneGroupsKeySeparationsRefractive index, appearance, birefringence, optic character and optic figure. A bull's-eye optic figure is determinative for quartz; may also show Airy's spiral optic figure and Brazil-law twinning under crossed polarizing filters.ClassificationCommentsColorless quartz with visible needle-like inclusions is a variety called "sagenitic." Stones with red hematite inclusions or "beetles-legs" may take a reddish appearance and be called "strawberry quartz." If colorless quartz contains golden blades of rutile it is often called "rutilated quartz."
Sagenitic-quartz chemistry & crystallographyChemicalNamesilicon dioxide (aka silica)ChemicalFormulaSiO2SynthesisCrystalSystemTrigonalChemistryClassificationSilicateNatureNaturalCrystallinityCrystallineChemistryComments
Sagenitic-quartz optical propertiesTransparencyTransparent - OpaqueDispersionStrength: weak fire Value: 0.013OpticalCommentsRefractiveIndex1.544-1.553
Tolerance:very constantBirefringence0.009OpticCharacterUniaxialOpticSignPositivePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV: Inert
Sagenitic-quartz characteristic physical propertiesHardness7CharacteristicCommentsStreakWhiteSpecificGravity2.64-2.69 Typical:2.66ToughnessGoodInclusionsSagenitic quartz may contain liquid, two-phase and three-phase inclusions, negative crystals, minerals, needles, rutile, tourmaline, actinolite needles and iron particles.LusterVitreousStabilityGoodFractureConchoidalCleavageNone