Tremolite Gemstone & Information | Gemopedia by JTV | Gemopedia™
Deriving its name from a locality in the Swiss Alps, tremolite is a member of the amphibole group, a complex series of silicate minerals. It forms in thin, parallel fibers, sometimes producing a distinct cat's eye effect when cut in cabochons. Tremolite comes in a variety of colors ranging from white, brown, colorless, gray, light green, light yellow and pink-violet. This gem sometimes occurs as fine, needle-like inclusions in emerald and quartz.
Gray, Green, Brown, Yellow, Lavender To Pink, White, Colorless
Tremolite classificationCommonNameTremoliteSpeciesTremoliteVarietyColorsGray, Green, Brown, Yellow, Lavender To Pink, White, ColorlessAlternateNamesChrome-Tremolite, Hexagonite, GrammatiteGemstoneGroupsKeySeparationsClassificationCommentsChrome-tremolite is the green variety of tremolite colored by chrome. Hexagonite is the transparent pink to lilac pink variety of tremolite. Stones can be chatoyant.
Tremolite chemistry & crystallographyChemicalNamecalcium magnesium iron silicateChemicalFormulaCa2Mg5Si8O22(OH)2SynthesisCrystalSystemMonoclinicChemistryClassificationSilicateNatureNaturalCrystallinityCrystalline to AggregateChemistryComments
Tremolite optical propertiesTransparencyTransparent - TranslucentDispersionStrength: weak fireOpticalCommentsRefractiveIndex1.56-1.643Birefringence0.017-0.027OpticCharacterBiaxialOpticSignNegativePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV: Inert to moderate orange to yellow
LWUV: Inert to moderate orange or pinkCCFReactionPleochroismUnobservable
Tremolite characteristic physical propertiesHardness5-6CharacteristicCommentsStreakWhiteSpecificGravity2.95-3.07ToughnessPoorInclusionsLusterVitreousStabilityFractureUnevenCleavagePerfect, in one direction