Zincite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Zincite

The majority of gem-quality zincite in the market is the byproduct of Polish metal refineries where the material crystallized in the factory smokestacks and was then harvested during cleaning. Zincite can also be found naturally in a few localities, most notably associated with metamorphosed zinc ore bodies in Sterling, New Jersey, though the crystals are rarely of gem quality.

Colors

Medium To Pale Yellow, Medium Orange, Medium To Dark Reddish-Orange, Red, Green

  • Zincite classification

    CommonName
    Zincite
    Species
    Zincite
    Variety
    Colors
    Medium To Pale Yellow, Medium Orange, Medium To Dark Reddish-Orange, Red, Green
    AlternateNames
    Red-Zinc Ore
    GemstoneGroups
    KeySeparations
    OTL RI, DR nature and SG
    ClassificationComments
    Natural stones or specimens come from mines in New Jersey. There are some man made stones that come from Poland and are a byproduct of zinc metal extraction from ore.
  • Zincite chemistry & crystallography

    ChemicalName
    zinc manganese oxide
    ChemicalFormula
    (Zn,Mn2+)O
    Synthesis
    CrystalSystem
    Hexagonal
    ChemistryClassification
    Oxide
    Nature
    Natural
    Crystallinity
    Crystalline to Aggregate
    ChemistryComments
  • Zincite optical properties

    Transparency
    Transparent - Opaque
    Dispersion
    Strength: weak fire Value: 0.127
    OpticalComments
    RefractiveIndex
    Over the Limit 2.013-2.029
    Birefringence
    0.016
    OpticCharacter
    Uniaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert to moderate yellow to orange or yellow-green
    LWUV: Inert to moderate yellow to yellow-orange
    CCFReaction
    Yellow: Inert to yellowish-green; Orange stone: weak pink; Reddish-orange: moderate red
    Pleochroism
    Unobservable
  • Zincite characteristic physical properties

    Hardness
    4
    CharacteristicComments
    Streak
    Orange-Yellow
    SpecificGravity
    5.5-5.9
    Toughness
    Poor
    Inclusions
    Luster
    SubAdamantine
    Stability
    Fracture
    Subconchoidal
    Cleavage
    Perfect, in one direction