Picture Agate Gemstone & Information | Gemopedia by JTV | Gemopedia™

Picture Agate

Picture agate displays natural inclusions that formed within the stone in such a way as to create well-defined images. These images have a natural, life-like, picturesque appearance and make picture agate a treasured stone among gemstone lapidaries.

Colors

Various Colors

  • Picture-agate classification

    CommonName
    Picture Agate
    Species
    Quartz
    Variety
    Chalcedony
    Colors
    Various Colors
    AlternateNames
    Landscape Agate Or Fortification Agate
    GemstoneGroups
    KeySeparations
    RI, SG, appearance and fracture
    ClassificationComments
  • Picture-agate chemistry & crystallography

    ChemicalName
    silicon dioxide (aka silica)
    ChemicalFormula
    SiO2
    Synthesis
    CrystalSystem
    Trigonal
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Polycrystalline
    ChemistryComments
  • Picture-agate optical properties

    Transparency
    Semitransparent - Semitranslucent
    Dispersion
    OpticalComments
    RefractiveIndex
    1.535-1.539
    Birefringence
    0.004-0.004
    OpticCharacter
    Uniaxial
    OpticSign
    Positive
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    None
  • Picture-agate characteristic physical properties

    Hardness
    6.5-7
    CharacteristicComments
    Streak
    SpecificGravity
    2.55-2.7 Typical:2.6
    Toughness
    Excellent
    Inclusions
    The picture agate inclusions form a pattern that give the appearance of a landscape or picture.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal, Granular
    Cleavage
    None