Sagenitic Quartz Gemstone & Information | Gemopedia by JTV | Gemopedia™

Sagenitic Quartz

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.

Colors

Colorless Quartz With Various Colored Inclusions

  • Sagenitic-quartz classification

    CommonName
    Sagenitic Quartz
    Species
    Quartz
    Variety
    Sagenitic Quartz
    Colors
    Colorless Quartz With Various Colored Inclusions
    AlternateNames
    Sagenite, Cupid's Darts, Fleches D'amour, Venus Hair Stone, Thetis Hair Stone And Cat's Fur Quartz
    GemstoneGroups
    KeySeparations
    Refractive 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.
    ClassificationComments
    Colorless 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 & crystallography

    ChemicalName
    silicon dioxide (aka silica)
    ChemicalFormula
    SiO2
    Synthesis
    CrystalSystem
    Trigonal
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Sagenitic-quartz optical properties

    Transparency
    Transparent - Opaque
    Dispersion
    Strength: weak fire Value: 0.013
    OpticalComments
    RefractiveIndex
    1.544-1.553
    Tolerance:very constant
    Birefringence
    0.009
    OpticCharacter
    Uniaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    None
  • Sagenitic-quartz characteristic physical properties

    Hardness
    7
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.64-2.69 Typical:2.66
    Toughness
    Good
    Inclusions
    Sagenitic quartz may contain liquid, two-phase and three-phase inclusions, negative crystals, minerals, needles, rutile, tourmaline, actinolite needles and iron particles.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal
    Cleavage
    None