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

Rutilated Quartz

Gemstones are usually treasured for their crystalline varieties that contain little or no inclusions. Some varieties, however, are favored because of their unique inclusions. One such variety is rutilated quartz. Striking in appearance, the thin, elongated red to golden rutile needles may form parallel to one another or have random distribution throughout the quartz. On rare occasions, needles may radiate in six different directions, creating a star-like pattern. Specimens exhibiting this pattern are the most highly prized of all.

Colors

Colorless With Reddish, Golden, Silvery, Greenish Needles

  • Rutilated-quartz classification

    CommonName
    Rutilated Quartz
    Species
    Quartz
    Variety
    Rutilated Quartz
    Colors
    Colorless With Reddish, Golden, Silvery, Greenish Needles
    AlternateNames
    Sagenitic 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 sometimes called "sagenitic."
  • Rutilated-quartz chemistry & crystallography

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

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