Chrysoprase Gemstone & Information | Gemopedia by JTV | Gemopedia™

Chrysoprase

One of the most coveted varieties of chalcedony quartz, chrysoprase is prized for its apple green color and rarity. Chrysoprase's name comes from the Greek words chrysos, meaning gold and prason, meaning leek, due to its color similarities with the vegetable.

Colors

Light To Medium Dark Yellowish Green, Apple Green

  • Chrysoprase classification

    CommonName
    Chrysoprase
    Species
    Quartz
    Variety
    Chalcedony
    Colors
    Light To Medium Dark Yellowish Green, Apple Green
    AlternateNames
    GemstoneGroups
    KeySeparations
    RI, SG and fracture
    ClassificationComments
    Color is natural and due to nickel. Color can fade if exposed to heat or sunlight and might be restored if stored in water. If found with brown or white matrix it is called chrysoprase matrix.
  • Chrysoprase chemistry & crystallography

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

    Transparency
    Semitransparent - Translucent
    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
    Pleochroism
    Unobservable
  • Chrysoprase characteristic physical properties

    Hardness
    6.5-7
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.55-2.7 Typical:2.6
    Toughness
    Varies
    Inclusions
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal, Granular
    Cleavage
    None