Marcasite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Marcasite

Marcasite is a polymorph of pyrite. It has the same chemistry, but a different crystal structure. In the jewelry trade, the names pyrite and marcasite are often used interchangeably. Marcasite is often cut and polished in a cone or pyramid shape and pav set between sterling silver beads to enhance their brilliance.

Colors

Metallic Yellow/Brassy

  • Marcasite classification

    CommonName
    Marcasite
    Species
    Marcasite
    Variety
    Colors
    Metallic Yellow/Brassy
    AlternateNames
    GemstoneGroups
    KeySeparations
    SG more brittle than pyrite
    ClassificationComments
    Marcasite is a polymorph of pyrite. Always wash your hands after handling the stone.
  • Marcasite chemistry & crystallography

    ChemicalName
    iron sulfide
    ChemicalFormula
    FeS2
    Synthesis
    CrystalSystem
    Orthorhombic
    ChemistryClassification
    Sulfide
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Marcasite optical properties

    Transparency
    Transparent - Semitransparent
    Dispersion
    OpticalComments
    RefractiveIndex
    1.81-0
    Birefringence
    OpticCharacter
    OpticSign
    PolariscopeReaction
    Fluorescence
    SWUV: None
    LWUV: None
    CCFReaction
    Pleochroism
    None
  • Marcasite characteristic physical properties

    Hardness
    6-6.5
    CharacteristicComments
    Streak
    Greenish Black
    SpecificGravity
    4.85-4.92 Typical:4.887
    Toughness
    Poor
    Inclusions
    Luster
    Metallic
    Stability
    Fracture
    Uneven
    Cleavage
    Good, in one direction