Wulfenite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Wulfenite

Known for its striking orange, yellow and red hues, nice luster and unique crystal habits, wulfenite is a lead molybdate that is found in the oxidation zone of lead-ore deposits. Wulfenite typically forms thin, tabular crystals and therefore, acquiring a crystal thick enough to fashion into a gem is challenging. In addition, great care must be taken during the faceting process because wulfenite is a delicate mineral.

Colors

Orange-Red, Yellow-Orange, Brown

  • Wulfenite classification

    CommonName
    Wulfenite
    Species
    Wulfenite
    Variety
    Colors
    Orange-Red, Yellow-Orange, Brown
    AlternateNames
    GemstoneGroups
    KeySeparations
    OTL RI, DR nature and SG
    ClassificationComments
    Wulfenite is heat sensitive.
  • Wulfenite chemistry & crystallography

    ChemicalName
    lead molybdate
    ChemicalFormula
    PbMoO4
    Synthesis
    CrystalSystem
    Tetragonal
    ChemistryClassification
    Nature
    Natural
    Crystallinity
    Crystalline to Aggregate
    ChemistryComments
  • Wulfenite optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: strong fire Value: 0.203
    OpticalComments
    RefractiveIndex
    Over the Limit 2.28-2.4
    Birefringence
    0.12-0.122
    OpticCharacter
    Uniaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert to weak yellow, orange or red
    LWUV: Inert to weak red
    CCFReaction
    Pleochroism
    Unobservable
  • Wulfenite characteristic physical properties

    Hardness
    3
    CharacteristicComments
    Streak
    White
    SpecificGravity
    6.5-7
    Toughness
    Poor
    Inclusions
    Luster
    Adamantine
    Stability
    Fracture
    Uneven, Subconchoidal
    Cleavage
    Good, in one direction, Poor, in two directions