Poldervaartite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Poldervaartite

Poldervaartite can be found in a light orange-pink to milky-white color. High-quality poldervaartite specimens are prized by collectors and facetable material is rare.

Colors

Colorless, Milky White, Light Orange-Pink, Pink-White

  • Poldervaartite classification

    CommonName
    Poldervaartite
    Species
    Poldervaartite
    Variety
    Colors
    Colorless, Milky White, Light Orange-Pink, Pink-White
    AlternateNames
    GemstoneGroups
    KeySeparations
    RI and birefringence.
    ClassificationComments
    Poldervaartite is only differentiated from olmiite by the percentage of Calcium versus Manganese in the specimen or gemstone.
  • Poldervaartite chemistry & crystallography

    ChemicalName
    calcium manganese silicate hydroxide
    ChemicalFormula
    (Ca,Mn2+)2(SiO3OH)(OH)
    Synthesis
    CrystalSystem
    Orthorhombic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline to Aggregate
    ChemistryComments
  • Poldervaartite optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: weak fire
    OpticalComments
    RefractiveIndex
    1.634-1.656
    Birefringence
    0.022
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Moderate red or pinkish white to pink
    LWUV: Weak red or pinkish white to pink
    CCFReaction
    Pleochroism
    Trichroic, unobservable or weak, varying shades of body color
  • Poldervaartite characteristic physical properties

    Hardness
    5
    CharacteristicComments
    Streak
    SpecificGravity
    Typical:2.91
    Toughness
    Poor
    Inclusions
    Luster
    Vitreous
    Stability
    Fracture
    Uneven
    Cleavage
    None