Glass Gemstone & Information | Gemopedia by JTV | Gemopedia™

Glass

Glass has been used for thousands of years as a decoration. It is sometimes employed as a gemstone simulant, but is often appreciated entirely upon its own merits, especially when formed with a high level of artistry.

Colors

All Colors

  • Glass classification

    CommonName
    Glass
    Species
    NA
    Variety
    Colors
    All Colors
    AlternateNames
    Paste, Strass, Faience
    GemstoneGroups
    KeySeparations
    RI, magnification and warm to touch.
    ClassificationComments
  • Glass chemistry & crystallography

    ChemicalName
    silica
    ChemicalFormula
    Synthesis
    CrystalSystem
    NA
    ChemistryClassification
    Nature
    Simulant
    Crystallinity
    Non-Crystalline
    ChemistryComments
  • Glass optical properties

    Transparency
    Transparent - Opaque
    Dispersion
    Strength: moderate if contains lead Value: 0.00901
    OpticalComments
    RefractiveIndex
    1.47-1.7
    Tolerance:can go OTL
    Birefringence
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV: Variable
    LWUV: Variable
    CCFReaction
    Pleochroism
    None
  • Glass characteristic physical properties

    Hardness
    5-6
    CharacteristicComments
    Streak
    SpecificGravity
    2.3-4.5
    Toughness
    Poor
    Inclusions
    Since glass has a low mohs hardness and is usually molded the stones will have mold marks, rounded facet edges, concave facets. It will also sometimes show orange peel effect or a bumpy surface that resembles an orange peel. Glass will often show cavities on the surface of the stone and swirl lines and glass bubbles internally.
    Luster
    Vitreous
    Stability
    Fracture
    Conchoidal, Granular, Splintery
    Cleavage
    None