Pyritized Ammonite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Pyritized Ammonite

Ammonites were marine animals that existed during the Jurassic and Cretaceous periods, and are related to modern-day octopi, squid and cuttlefish. The same event that wiped out dinosaurs was the end of this species, as well. Pyritized ammonite occurs when, during petrification, the ammonite's organic material is replaced with pyrite, or iron disulfide more commonly known as 'fool's gold'. The result is a beautifully preserved and durable ammonite fossil.

Colors

Metallic Yellow/Brassy

  • Pyritized-ammonite classification

    CommonName
    Pyritized Ammonite
    Species
    Pyrite
    Variety
    Colors
    Metallic Yellow/Brassy
    AlternateNames
    GemstoneGroups
    KeySeparations
    Appearance
    ClassificationComments
  • Pyritized-ammonite chemistry & crystallography

    ChemicalName
    iron sulfide
    ChemicalFormula
    FeS2
    Synthesis
    CrystalSystem
    NA
    ChemistryClassification
    Sulfide
    Nature
    Natural
    Crystallinity
    ChemistryComments
  • Pyritized-ammonite optical properties

    Transparency
    Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    1.81-0
    Birefringence
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Fluorescence
    CCFReaction
    Pleochroism
    None
  • Pyritized-ammonite characteristic physical properties

    Hardness
    6-6.5
    CharacteristicComments
    Streak
    Greenish To Brownish Black Streak
    SpecificGravity
    4.9-5.1 Typical: 5
    Toughness
    Poor
    Inclusions
    pyritized ammonite is fossil ammonite that has been replaced by pyrite. Well preserved specimens show nautilus or spiral like appearance.
    Luster
    Metallic
    Stability
    Fracture
    Conchoidal, Uneven
    Cleavage
    None