Dioptase Gemstone & Information | Gemopedia by JTV | Gemopedia™

Dioptase

Dioptase is a bright emerald-green or blue-green gemstone noted for the visibility of internal cleavage planes. The transparent to translucent dioptase gemstone is uncommon and generally found in desert regions. Rivaling the beauty of emerald, dioptase is typically sold as specimens and gemstones are rarely seen, especially in sizes over 1 carat.

Colors

Intense Bluish Green

  • Dioptase classification

    CommonName
    Dioptase
    Species
    Dioptase
    Variety
    Colors
    Intense Bluish Green
    AlternateNames
    GemstoneGroups
    KeySeparations
    color, RI, birefringence, cleavage and optic charater
    ClassificationComments
  • Dioptase chemistry & crystallography

    ChemicalName
    ChemicalFormula
    CuSiO2(OH)2
    Synthesis
    CrystalSystem
    Trigonal
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Dioptase optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: moderate fire Value: 0.036
    OpticalComments
    RefractiveIndex
    1.644-1.709
    Tolerance:(+0.012/-0.012)
    Birefringence
    0.051-0.053
    OpticCharacter
    Uniaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: inert
    LWUV: inert
    CCFReaction
    Pleochroism
    Dichroic, unobservable or weak, varying shades of body color
  • Dioptase characteristic physical properties

    Hardness
    5
    CharacteristicComments
    Streak
    Greenish
    SpecificGravity
    3.28-3.35 Typical:3.3
    Toughness
    Poor
    Inclusions
    Luster
    Vitreous
    Stability
    Fracture
    Conchoidal, Uneven
    Cleavage
    Perfect, in one direction