Chrome Chalcedony Gemstone & Information | Gemopedia by JTV | Gemopedia™

Chrome Chalcedony

Chrome chalcedony contains chromium, normally seen in the most coveted gems in the world; namely alexandrite, emerald and ruby. Present in small amounts, chromium gives these stones their unique shades of green, which have been compared to green seawater. Chrome chalcedony is usually untreated, as absolutely nothing is required to make this stone desirable! Although chrome chalcedony somewhat resembles chrysoprase in appearance, the two receive their color from two different elements.

Colors

Green To Slightly Bluish Green

  • Chrome-chalcedony classification

    CommonName
    Chrome Chalcedony
    Species
    Quartz
    Variety
    Chalcedony
    Colors
    Green To Slightly Bluish Green
    AlternateNames
    Mtorodite Or Mtorolite
    GemstoneGroups
    KeySeparations
    Appearance, fracture, refractive index, spectrum
    ClassificationComments
    Mtorodite or mtorolite: trade name for chrome chalcedony from Zimbabwe.Colored by chromium.
  • Chrome-chalcedony chemistry & crystallography

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

    Transparency
    Transparent - Semitranslucent
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    1.535-1.539
    Birefringence
    0.004-0.004
    OpticCharacter
    Uniaxial
    OpticSign
    Positive
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Light grayish pink or reddish
    Pleochroism
    None
  • Chrome-chalcedony characteristic physical properties

    Hardness
    6.5-7
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.55-2.7 Typical:2.6
    Toughness
    Excellent
    Inclusions
    Chrome chalcedony might contain black chromite crystals. Look for lack of dye concentrations to separate from dyed chalcedony.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal, Granular
    Cleavage
    None