Marble Gemstone & Information | Gemopedia by JTV | Gemopedia™

Marble

Marble is a granular metamorphic rock formed under the influence of heat and pressure, and consists of a mass of interlocking calcite or dolomite grains. Pure marble is white, and some other marbles take their common names from their color or mineral impurities. Marble is often used for fine building material or sculpture, thanks to its beautiful appearance.

Colors

Various

  • Marble classification

    CommonName
    Marble
    Species
    NA
    Variety
    NA
    Colors
    Various
    AlternateNames
    GemstoneGroups
    KeySeparations
    cleavage, refractive index, birefringence, strong doubling (if transparent), specific gravity. Use birefringence blink method.
    ClassificationComments
    Misnomers: Mexican jade. Type of limestone used for ornamental objects. Onyx marble if banded.
  • Marble chemistry & crystallography

    ChemicalName
    calcium carbonate
    ChemicalFormula
    CaCO3
    Synthesis
    CrystalSystem
    Trigonal
    ChemistryClassification
    Carbonate
    Nature
    Natural
    Crystallinity
    Aggregate
    ChemistryComments
  • Marble optical properties

    Transparency
    Semitranslucent - Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    1.486-1.658
    Birefringence
    0.172-0.172
    OpticCharacter
    NA
    OpticSign
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV: Variable
    LWUV: Variable
    CCFReaction
    Pleochroism
    None
  • Marble characteristic physical properties

    Hardness
    3
    CharacteristicComments
    Streak
    Varies By Color
    SpecificGravity
    2.65-2.75 Typical:2.7
    Toughness
    Varies
    Inclusions
    Marble is often dyed.
    Luster
    Vitreous
    Stability
    Fair
    Fracture
    Uneven, Granular, Splintery
    Cleavage
    None