Diaspore Gemstone & Information | Gemopedia by JTV | Gemopedia™

Diaspore

Diaspore is beautiful and exotic in a soft, subtle manner. It is also one of the lesser known of the color-change gemstones. Some of the finest examples of gem quality diaspore are found in Turkey's Anatolian Mountains, but it can be found in numerous places around the globe. A rising star in fine jewelry, it's easy to fall in love with its sparklingly brilliant, tranquil earthy colors.

Colors

White, Pale Gray, Colorless, Greenish Gray, Brown, Pale Yellow, Pink, Lilac

  • Diaspore classification

    CommonName
    Diaspore
    Species
    Diaspore
    Variety
    Colors
    White, Pale Gray, Colorless, Greenish Gray, Brown, Pale Yellow, Pink, Lilac
    AlternateNames
    Zultanite(R), Csarite
    GemstoneGroups
    Diaspore
    KeySeparations
    RI and birefringence
    ClassificationComments
    Strong color change variety sold under the name Zultanite(R)
  • Diaspore chemistry & crystallography

    ChemicalName
    aluminum oxide hydroxide
    ChemicalFormula
    AlO(OH)
    Synthesis
    CrystalSystem
    Orthorhombic
    ChemistryClassification
    Oxide
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Diaspore optical properties

    Transparency
    Transparent
    Dispersion
    Strength: weak fire
    OpticalComments
    RefractiveIndex
    1.702-1.75
    Birefringence
    0.048
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV:
    LWUV:
    CCFReaction
    Pleochroism
    Dichroic, strong reddish violet to reddish brown or green to grayish green
  • Diaspore characteristic physical properties

    Hardness
    6.5-7
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.3-3.39 Range:0.12/-0.18 Typical:3.38
    Toughness
    Inclusions
    Luster
    Vitreous
    Stability
    Fracture
    Conchoidal
    Cleavage
    Perfect, in one direction, Good, in one direction