Datolite Gemstone & Information | Gemopedia by JTV | Gemopedia™

Datolite

Datolite is a phyllo-borosilicate commonly forming as nodules in igneous rocks. Facet-grade material rarely yields gems larger than 10 carats, with most being significantly smaller. Colorless, transparent datolite gems can be found in several locations worldwide, but many come from Connecticut, Massachusetts, New Jersey, and Virginia. Copper-stained, opaque nodules from Michigan are typically fashioned into cabochons.

Colors

Colorless, White, Light Green, Light Yellow, Pink, Violet, Brown, Gray

  • Datolite classification

    CommonName
    Datolite
    Species
    Datolite
    Variety
    Colors
    Colorless, White, Light Green, Light Yellow, Pink, Violet, Brown, Gray
    AlternateNames
    GemstoneGroups
    Datolite
    KeySeparations
    RI, birefringence, optic sign and SG
    ClassificationComments
  • Datolite chemistry & crystallography

    ChemicalName
    ChemicalFormula
    CaBSiO4(OH)
    Synthesis
    CrystalSystem
    Monoclinic
    ChemistryClassification
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Datolite optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: weak fire Value: 0.016
    OpticalComments
    RefractiveIndex
    1.626-1.67
    Tolerance:-0.004
    Birefringence
    0.044-0.046
    OpticCharacter
    Biaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV:
    LWUV:
    CCFReaction
    Pleochroism
    Unobservable
  • Datolite characteristic physical properties

    Hardness
    5-5.5
    CharacteristicComments
    Streak
    SpecificGravity
    3-2.9 Typical:2.95
    Toughness
    Fair
    Inclusions
    Luster
    Vitreous
    Stability
    Fracture
    Conchoidal, Uneven
    Cleavage
    None