Brookite In Quartz Gemstone & Information | Gemopedia by JTV | Gemopedia™

Brookite In Quartz

Brookite is a polymorph to rutile and anatase, meaning it shares the same chemical properties, but crystallizes differently. It occasionally is found included within quartz as a red to brown colored crystal.

Colors

Colorless With Brown, Yellow Brown, Reddish Brown Inclusions

  • Brookite-in-quartz classification

    CommonName
    Brookite In Quartz
    Species
    Quartz
    Variety
    Colors
    Colorless With Brown, Yellow Brown, Reddish Brown Inclusions
    AlternateNames
    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
    Brookite is a form of titanium dioxide.
  • Brookite-in-quartz chemistry & crystallography

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

    Transparency
    Transparent - Translucent
    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
  • Brookite-in-quartz characteristic physical properties

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