Matrix Opal Gemstone & Information | Gemopedia by JTV | Gemopedia™
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.
Brown With Seams Of Play-Of-Color
Matrix-opal classificationCommonNameMatrix OpalSpeciesOpalVarietyMatrix OpalColorsBrown With Seams Of Play-Of-ColorAlternateNamesPrecious Opal In Matrix, Natural Opal Type 3GemstoneGroupsKeySeparationsAppearance, RI and fluorescenceClassificationCommentsYowah 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 & crystallographyChemicalNamehydrated silicon dioxideChemicalFormulaSiO2.nH2OSynthesisCrystalSystemNAChemistryClassificationSilicateNatureNaturalCrystallinityAmorphousChemistryComments
Matrix-opal optical propertiesTransparencyTransparent - OpaqueDispersionStrength: noneOpticalCommentsRefractiveIndexBirefringenceOpticCharacterOpticSignPolariscopeReactionSingly Refractive (SR) With ADRFluorescenceSWUV: Variable
Matrix-opal characteristic physical propertiesHardness5-6.5CharacteristicCommentsStreakWhiteSpecificGravity1.98-2.25ToughnessVariesInclusionsOpal 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.LusterVitreousStabilityFractureConchoidal, UnevenCleavageNone