摘要
近期苏纪石受到许多珠宝爱好者的喜爱,随着市场的火热仿制品也随之出现,但对于苏纪石仿制品的研究较少。采用常规宝石学鉴定、傅里叶变换红外光谱仪、拉曼光谱仪、紫外-可见光谱仪等测试方法,对近期检测中集中出现的一种苏纪石仿制品进行了常规宝石学和谱学特征研究。结果显示,该苏纪石仿制品表面颜色不均匀,凹坑、裂隙处颜色富集,且经酒精擦拭后掉色。红外光谱分析显示该苏纪石仿制品主要含叶蛇纹石和方解石两种矿物,出现了方解石1420、874、712 cm^(-1)的红外特征吸收峰,叶蛇纹石3686、1083、968、611、570、436 cm^(-1)的红外特征吸收峰。拉曼光谱分析出现方解石150、277、708、1080 cm^(-1)的拉曼位移,白云石168、291、717、1090 cm^(-1)的拉曼位移,以及叶蛇纹石127、220、373、457、515、628、682、1039 cm^(-1)的拉曼位移。紫外-可见光光谱分析可见580 nm左右的强宽吸收带,推测可能是由含Mn^(3+)的外界染剂染色而成。这种苏纪石的仿制品与苏纪石有明显区别,是由蓝田玉染色而成,根据国家标准应定名为蓝田玉(染色)。
Recently,sugilite has become popular among jewelry lovers,with the hot market,its imitations have appeared.However,few researches have been done on sugilite imitations.The conventional gemmological and spectroscopic characteristics of a kind of sugilite imitation product that appeared recently was studied by conventional gemmological tests,Fourier transform infrared spectrometer(FTIR),Raman spectrometer,and UV-Vis spectrometer.The results showed that the sugilite imitation has uneven surface colour,with colour enrichment at pits and fissures,and colour loss after alcohol wiping.Infrared spectroscopic analysis showed that this sugilite imitation mainly contains two minerals,serpentine and calcite,with infrared characteristic absorption peaks of 1420,874 cm^(-1) and 712 cm^(-1) for calcite and 3686,1083,968,611,570 cm^(-1) and 436 cm^(-1) for serpentine.Raman spectral analysis showed Raman shifts of calcite 150,277,708,1080 cm^(-1),dolomite 168,291,717,1090 cm^(-1),and serpentine 127,220,373,457,515,628,682,1039 cm^(-1).The strong broad absorption band around 580 nm is visible in the ultraviolet visible spectral analysis,which is presumed to be stained by an external stain containing Mn^(3+).This imitation of sugilite is clearly different from sugilite,which is dyed by Lantian jade.It should be designated as Lantian jade(dyed)according to the national standard of Gems-Nomenclatur.
作者
陈玉炜
王玲
张峰
葛梦雅
王海友
CHEN Yuwei;WANG Ling;ZHANG Feng;GE Mengya;WANG Haiyou(Testing Center for Gold and Jewelry of Jiangsu Province,Nanjing 210016,China)
