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

Aventurine Quartz

Aventurine is a form of quartz, distinguished by its translucent to opaque appearance and the presence of mineral inclusions that give a shimmering or glittery effect termed aventurescence. The phenomenon of aventurescence is caused by small leaf-like or plate-like inclusions, usually mica, distributed throughout the host material. Light striking the surface of these inclusions is reflected back to the viewer, creating an eye-catching sparkle. While customarily green in color, aventurine may also be found in colors ranging from blue, orange, white, yellow, reddish-brown to gray.

Colors

Green, Gray, Yellow, Brown

  • Aventurine-quartz classification

    CommonName
    Aventurine Quartz
    Species
    NA
    Variety
    Colors
    Green, Gray, Yellow, Brown
    AlternateNames
    Aventurine
    GemstoneGroups
    KeySeparations
    Appearance, RI and magnification.
    ClassificationComments
    Misnomer: Indian Jade for green variety. Aventurine quartz is quartzite that shows aventurescence.
  • Aventurine-quartz chemistry & crystallography

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

    Transparency
    Translucent - Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    1.544-1.553
    Tolerance:very constant
    Birefringence
    0.009
    OpticCharacter
    OpticSign
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV: Inert to weak grayish green or reddish
    LWUV: Inert to weak grayish green or reddish
    CCFReaction
    Pleochroism
    None
  • Aventurine-quartz characteristic physical properties

    Hardness
    7
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.64-2.69 Typical:2.66
    Toughness
    Good
    Inclusions
    Aventurine quartz will have green disk-like chrome-mica fuchsite flakes or platlets that can be seen with magnification.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal, Granular
    Cleavage
    None