Matrix Opal Gemstone & Information | Gemopedia by JTV | Gemopedia™

Matrix Opal

Opal in matrix gems consist of precious opal, often cut en cabochon, with an outer layer of its host rock still attached. This stark contrast of glittering translucent opal with earthy rock makes for beautiful, one-of-a-kind pieces.

Colors

Brown With Seams Of Play-Of-Color

  • Matrix-opal classification

    CommonName
    Matrix Opal
    Species
    Opal
    Variety
    Matrix Opal
    Colors
    Brown With Seams Of Play-Of-Color
    AlternateNames
    Precious Opal In Matrix, Natural Opal Type 3
    GemstoneGroups
    KeySeparations
    Appearance, RI and fluorescence
    ClassificationComments
    Yowah opal is a boulder matrix opal that is cut to display the small seams mixed through out the ironstone. Mainside: boulder matrix opal from Queensland, Australia. Honduras opal: comes from Honduras and has a basalt matrix. Louisiana opal: has a quartzite matrix. Indonesian opal: has dark brown basalt matrix that appears black.
  • Matrix-opal chemistry & crystallography

    ChemicalName
    hydrated silicon dioxide
    ChemicalFormula
    SiO2.nH2O
    Synthesis
    CrystalSystem
    NA
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Amorphous
    ChemistryComments
  • Matrix-opal optical properties

    Transparency
    Transparent - Opaque
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    Birefringence
    OpticCharacter
    OpticSign
    PolariscopeReaction
    Singly Refractive (SR) With ADR
    Fluorescence
    SWUV: Variable
    LWUV: Variable
    CCFReaction
    Pleochroism
    None
  • Matrix-opal characteristic physical properties

    Hardness
    5-6.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    1.98-2.25
    Toughness
    Varies
    Inclusions
    Opal in matrix is precious opal mixed throughout a brown ironstone, quartzite, rhyolite or basalt host rock. Stones will have a pock marked appearance with little holes when viewed with a 10X loupe.Andamooka matrix opal will have sheets of color broken up by non-opal material and the edges of color will appear serrated. Andamooka matrix opal is often dyed black and will have black color concentrations that can be seen under magnification. Chips on the stones surface might expose the white inner core. Honduras opal has small flecks of opal in matix that give it a pinfire appearance and it is lighter than other opal.
    Luster
    Vitreous
    Stability
    Fracture
    Conchoidal, Uneven
    Cleavage
    None