Pietersite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Pietersite

Pietersite is a striking variety of chalcedony that comes primarily from Namibia and, more recently, China. It commonly exhibits various shades of color, ranging from blue to gray and red to yellow and brown. Pietersite displays chatoyancy similar to tigers eye quartz.

Colors

Blue-Gray, Brown, Golden Yellow, Red

  • Pietersite classification

    CommonName
    Pietersite
    Species
    Quartz
    Variety
    Chalcedony
    Colors
    Blue-Gray, Brown, Golden Yellow, Red
    AlternateNames
    GemstoneGroups
    KeySeparations
    Color, appearance, structure and RI
    ClassificationComments
    Pietersite is similar to tiger's-eye but pietersite is a chalcedony and tiger's-eye is a macrocrystalline quartz.
  • Pietersite chemistry & crystallography

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

    Transparency
    Semitranslucent - Opaque
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    1.544-1.553
    Tolerance:very constant
    Birefringence
    0.004-0.004
    OpticCharacter
    Uniaxial
    OpticSign
    Positive
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    None
  • Pietersite characteristic physical properties

    Hardness
    7
    CharacteristicComments
    Streak
    SpecificGravity
    2.64-2.69 Typical:2.66
    Toughness
    Good
    Inclusions
    Pietersite's broken up undulating chatoyant fibrous structure was caused by geologic stresses.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Splintery
    Cleavage
    None