Whewellite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Whewellite

Whewellite is an unusual mineral because it is a naturally occurring rare organic substance with a definitive chemical formula. Minerals are traditionally inorganic, but whewellite forms crystals with the aid of oxalic acid from coal or organic debris within sedimentary rocks. This mineral is seldom seen by collectors, and almost never as a faceted gem.

Colors

White, Yellow, Brown, Gray, Colorless

  • Whewellite classification

    CommonName
    Whewellite
    Species
    Whewellite
    Variety
    Colors
    White, Yellow, Brown, Gray, Colorless
    AlternateNames
    GemstoneGroups
    KeySeparations
    RI and DR nature.
    ClassificationComments
    Rare
  • Whewellite chemistry & crystallography

    ChemicalName
    hydrated calcium oxalate
    ChemicalFormula
    Ca(C2O4).H2O
    Synthesis
    CrystalSystem
    Monoclinic
    ChemistryClassification
    Organic
    Nature
    Natural
    Crystallinity
    Crystalline to Aggregate
    ChemistryComments
  • Whewellite optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    1.489-1.651
    Birefringence
    0.159-0.163
    OpticCharacter
    Biaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    Unobservable
  • Whewellite characteristic physical properties

    Hardness
    2.5-3
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.19-2.25
    Toughness
    Poor
    Inclusions
    Luster
    Vitreous
    Stability
    Fracture
    Conchoidal
    Cleavage
    Good, in one direction, Poor, in three directions