淡水珍珠中球文石的XRD谱马红艳

:2003-03-02:(:20266002):1000-4734(2003)04-0371-03XRD马红艳1,崔福斋(1.,530005;2.,100084):CaCO3,。XRD,,;、;,,XRD。:;;;XRD:P575;TU458　　:A:,,1970,,,.　　,,CaCO3。,CaCO3———(Cal-cite)、(Aragonite)(Vaterite,)。[1],,[2,3],[4～7],,。[6],,XRD,。1　　　:、,,,、。,X。:SIEMENSD500X,CuKα,35kV,30mA,,2θ2(°)/min,24°～72°。2　　　1XRD,1,X2,2、JCPDS。,,,。,0.303nm,,。1　Table1.Phaseanalysesofgood-andpoor-qualityfreshwaterculturedpearls,,,0.303nm,,,,0.303nm,,,,0.303nm,,3.571、3.289、2.732、2.061、1.821、1.644,,　23　4200312　　　矿　物　学　报　ACTAMINERALOGICASINICA　Vol.23.No.4Dec.,2003DOI:10.16461/j.cnki.1000-4734.2003.04.0151　XFig.1.X-raydiffractionpatternsofdifferentqualityfresh-waterpearls.2　、XTable2.X-raypowderdiffractiondataofpoor-andgood-qualitypearlsandcalciumcarbonatemineralsX[4]33-2685-045324-27dI/I0dI/I0dI/I0dI/I0dI/I00.35698①0.3390940.4219250.421220.385229②0.33941000.3268550.357160②0.3273650.303460.3396100②0.304450.2868120.3289100②0.327352②0.3030100②0.2871140.26991000.287140.283420.273020①0.2482410.273290②0.273090.2702740.2406160.270046②0.2483460.2370480.248133②0.249570.2408170.2330260.2409140.2373480.218790.237238②0.2336350.2103160.232050.234131②0.2190120.1975470.232860.228418②0.2105200.1878300.2188110.20609①0.1813260.206160②0.2106230.209427②0.1976660.1742370.197765②0.192640.1879370.1725220.1877250.1907170.1813270.155750.185530②0.1814230.187234②0.1743350.141380.182170②0.1742250.1726240.135970.1728150.16336①0.164430②0.155740.162520.141190.1477100.141150.1604150.1366100.13583　:①,②.372　　　　　　　　　　　　　　　　　　　　　　　　2003　　[8],———,CaCO2,,,,CaCO2、、。,,XRDD3.5693,2.730,2.060,1.633;,,,。3　　　　,,,,,-,CaCO2。　　　:[1]　.[M].:,1997.[2]AC.、[M].:,1984.[3]　VC.[M].:,1982.195.[4]　.X[M].:,1980.[5]　,,..———[J].,2003,23(1):45～50.[6]　,,[J].,2001,21(2):153～157.[7]　,[D].:,1999.[8]　,.[J].,2003,23(3):241～244.XRDPATTERNSOFVATERITEINBIOMINERALIZEDFRESHWATERPEARLSMAHong-yan1,CUIFu-zhai2　(1.CollegeofChemistryEngineering,GuangxiUniversity,Nanning530005,China;2.DepartmentofMaterialScienceandEngineering,TsinghuaUmversity,Beijing10084,China)Abstract:Differentlusterfreshwaterpearls(consistingofcalciumcarbonate)inChinawereexaminedwithX-raydiffraction(XRD).Themaincomponentofgood-qualityfreshwaterpearlsisaragoniteinallcases.Onlyatraceamountofcalcite(2%)wasfound,butinsomecases,amineramountofvateritewasdetectableinsomeluster-lessfreshwaterpearls.Vateriteisaveryunstablepolymorphofcalciumcarbonate,rarelyoccurringinnature.ThispaperpresentstheXRDpatternsofvateriteinpoor-qualityfreshwaterpearls.Keywords:freshwaterculturedpearl;vaterite;biomineralization;XRDpattern3734　　　　　　　　　　　　　　　　　　　:XRD