Nephrite Jade Gemstone & Information | Gemopedia by JTV | Gemopedia™

Nephrite Jade

Jade has been treasured for some 7,000 years for its unique luster, lovely color and impeccable toughness. This precious gem has always had special significance in many Asian cultures, and can be compared to the West's admiration of diamonds and gold. For centuries, nephrite jade and jadeite were considered one and the same. It was not until 1863 that they were identified as different minerals with a similar appearance and properties.

Colors

Light To Dark Grayish Green, Light To Dark Yellow To Brown, White, Light To Dark Gray, Black; Often Mottled; Light To Dark Pinkish Lavender If Dyed

  • Nephrite-jade classification

    CommonName
    Nephrite Jade
    Species
    Nephrite
    Variety
    Colors
    Light To Dark Grayish Green, Light To Dark Yellow To Brown, White, Light To Dark Gray, Black; Often Mottled; Light To Dark Pinkish Lavender If Dyed
    AlternateNames
    New Zealand Greenstone, New Zealand Jade, Mutton Fat, Chicken Bone, Tomb Jade Or Grave Jade, Polar Jade
    GemstoneGroups
    KeySeparations
    appearance, RI and SG. Scratch test can be used but is destructive.
    ClassificationComments
    Commonly has a 1.61 spot reading. New Zealand greenstone, New Zealand jade or spinach jade: dark grayish greenMutton fat: translucent white to very light yellowChicken bone: opaque white to very light brown or grayTomb or grave jade: ancient burial pieces with surface material altered to a brown or a white chalky looking texture. Polar jade: bright green
  • Nephrite-jade chemistry & crystallography

    ChemicalName
    calcium magnesium or iron silicate
    ChemicalFormula
    Ca2(Mg,Fe)5Si8O22(OH)2
    Synthesis
    CrystalSystem
    Monoclinic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Polycrystalline
    ChemistryComments
  • Nephrite-jade optical properties

    Transparency
    Translucent - Opaque
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    1.606-1.632
    Tolerance:(+0.009/-0.006)
    Birefringence
    OpticCharacter
    OpticSign
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    Unobservable
  • Nephrite-jade characteristic physical properties

    Hardness
    6-6.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.9-3.1 Typical:2.95
    Toughness
    Excellent
    Inclusions
    Stone may have black inclusions. If the stone is dyed it might show color concentrations.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Splintery, Granular
    Cleavage
    None