Antigorite Gemstone & Information | Gemopedia by JTV | Gemopedia™
Antigorite is a hard, compact variety of serpentine occurring either in corrugated plates or fibers. Serpentine is well known to mineralogists and gemologists, but is much less familiar to the general public. Often similar to jade in appearance, it is primarily used an ornamental material and has been carved into a wide array of decorative objects throughout history. Antigorite is usually green, but may be yellowish, gray, brown or black.
Dark Green, Blue-Green, Yellowish, Gray, Brown, Black
Antigorite classificationCommonNameAntigoriteSpeciesAntigoriteVarietyColorsDark Green, Blue-Green, Yellowish, Gray, Brown, BlackAlternateNamesGemstoneGroupsSerpentineKeySeparationsRI, magnification, spectrum, appearance and surface condition.ClassificationCommentsAntigorite is a hard compact variety of serpantine that occurs in pleated masses.
Antigorite chemistry & crystallographyChemicalNamehydrous magnesium iron phyllosilicateChemicalFormula(Mg)3Si2O5(OH)4SynthesisCrystalSystemMonoclinicChemistryClassificationSilicateNatureNaturalCrystallinityMicrocrystallineChemistryComments
Antigorite optical propertiesTransparencySemitransparent - OpaqueDispersionOpticalCommentsRefractiveIndex1.557-1.571BirefringenceOpticCharacterBiaxialOpticSignNegativePolariscopeReactionAggregate (AGG)FluorescenceSWUV:
Antigorite characteristic physical propertiesHardness2.5-3.5CharacteristicCommentsStreakWhiteSpecificGravity2.58-2.61ToughnessPoorInclusionsAntigorite often shows scratches and poor polish due to low mohs hardness. Stones are fine grained and has a flaky structure.LusterWaxyStabilityFractureGranular, UnevenCleavagePerfect, in one direction