一种达碧兹石榴石的宝石学和谱学特征  

Preliminary Study on the Restoration Modeling of Turquoise Jewelry Unearthed from the No.D107 Tomb(Bamudun Tomb)in Longshan,Anji,Zhejiang Province Gemmological and Spectroscopic Characteristics of A Type of Trapiche Garnet

作　　者：孙奕哲 谭煜源 陈结茵 高孔 蔡元洋 唐丰成 吴亮亮 潘成强 SUN Yizhe;TAN Yuyuan;CHEN Jieyin;GAO Kong;CAI Yuanyang;TANG Fengcheng;WU Liangliang;PAN Chengqiang(Jewellery Testing Department,Foshan Shunde Yuda Jewellery Manufcturing Co.,Ltd.,Foshan 528300,China;Jewelry Institute,Guangzhou Panyu Polytechnic,Guangzhou 511483,China;Jewellery Testing Department,Chow Tai Fook Jewellery Co.,Ltd.,Shenzhen 518000,China;Jewellery Testing Department,Guangdong Shunde Chow Tai Fook Jewellery Manufacturing Co.,Ltd.,Foshan 528300,China;National Gems&Jewelry Testing Co.,Ltd.,Shenzhen 518020,China;Guangzhou Panyu Polytechnic Gem&Jewelry Testing Center,Guangzhou 511400,China)

机构地区：[1]佛山市顺德区裕达珠宝首饰制造有限公司珠宝检验部,广东佛山528300 [2]广州番禺职业技术学院珠宝学院,广东广州511483 [3]周大福珠宝金行(深圳)有限公司珠宝检验部,广东深圳518000 [4]广东顺德周大福珠宝制造有限公司珠宝检验部,广东佛山528300 [5]珠宝国检集团深圳实验室,广东深圳518020 [6]广州番禺职业技术学院珠宝玉石及首饰检测中心,广东广州511400

出　　处：《宝石和宝石学杂志(中英文)》2025年第1期30-38,共9页Journal of Gems & Gemmology

基　　金：广州番禺职业技术学院校级科研项目(2023KJ07)。

摘　　要：随着宝石学、矿物学研究深入,越来越多的宝石中发现达碧兹或类达碧兹结构,丰富宝石市场的同时,也促进了关于晶体生长和相关矿物地质成因的认知。达碧兹石榴石概念虽然偶有提及,但尚未有资料详细揭示其具体特征。本研究通过常规宝石学测试、红外光谱、拉曼光谱、激光剥蚀诱导等离子质谱、电子探针、紫外-可见光谱以及M-BOX1.0扫描仪等技术手段测试分析,全面研究了一组达碧兹石榴石的宝石学和矿物学特征。基于电子探针测试和阴离子法计算得到,达碧兹石榴石样品的化学式为Ca_(2.97)(Al_(1.97)Ti_(0.02)Fe_(0.02)Mg_(0.01))_(2.02)[(Si_(2.97)Al_(0.03))]_(3.00)O_(12)和Ca_(2.95)(Al_(1.98)Ti_(0.01)Fe_(0.02)Mg_(0.01))_(2.02)[(Si_(2.98)Al_(0.02))]_(3.00)O_(12);结合红外光谱和拉曼光谱判定样品为钙铝榴石,含少量的结构水;激光剥蚀诱导等离子质谱测试显示,样品含有Na、Mg、K、Cr、Fe等微量元素;紫外-可见光谱显示315、370、410 nm处的吸收,结合微量元素测试结果及前人关于石榴石颜色的研究,初步推测Fe、Cr和Mn致使晶体基体呈淡粉色;拉曼光谱测试显示黑色包裹体为石墨,受钙铝榴石晶体结构控制分布在以菱形面为底、对称中心为顶的菱形锥的锥面上,当垂直〈111〉(L^(3)轴方向)切割时,这些石墨包裹体呈现出达碧兹结构的六射臂。钙铝榴石中较少的重元素和石墨等较轻的杂质包裹体,与样品较小的折射率(1.728~1.730)、偏低的相对密度(3.52~3.59)相匹配。As gemmological and mineralogical research progresses,the trapiche or trapiche-like phenomenon is increasingly discovered in various gemstones,which enriches the gemstone market and promotes understanding of crystal growth and related mineral geological origins.While the concept of trapiche garnet is occasionally mentioned,detailed information on its specific characteristics remains scarce.In this study,the authors comprehensively investigated the gemmological and mineralogical characteristics of a group of trapiche garnets utilizing conventional gemmological methods,Fourier transform infrared spectrometer(FTIR),Raman spectrometer,laser ablation-inductively coupled plasma-mass spectrometry(LA-ICP-MS),electron probe microanalysis(EPMA),ultraviolet-visible(UV-Vis)absorption spectrophotometer and X-BOX1.0 scanner.Based on EPMA testing results and anion method calculations,the chemical formula of the samples is determined to be Ca _(2.97)(Al _(1.97) Ti _(0.02) Fe _(0.02 )Mg _(0.01))_(2.02)[(Si _(2.97) Al _(0.03))]_(3.00) O _(12)和Ca _(2.95)(Al _(1.98) Ti _(0.01) Fe _(0.02) Mg _(0.01))_(2.02)[(Si _(2.98) Al _(0.02))]_(3.00) O _(12).Combined FTIR and Raman analyses,it was confirmed that the samples are as grossular garnets containing a small amount of structural water.The LA-ICP-MS testing results showed that the samples mainly contained the trace elements such as Na,Mg,K,Cr,and Fe.The UV-Vis spectrum shows absorption at 315,370,410 nm.Based on trace element analysis,UV-Vis spectrum data,and previous studies on the colour of garnet,it is preliminarily speculated that Fe,Cr,and Mn are responsible for the light pink colour of the crystal matrix.The black inclusions of graphite determined by Raman spectrometer are controlled by the crystal structure of calcium-aluminite and distributed on the rhombohedral symmetry surface.Diamond View TM observation confirms the entire grossular garnet to be a single crystal.When cut perpendicular to〈111〉(the L^(3) axis direction),the graphite inclusions exhibit the six-armed trapich

关 键 词：达碧兹 钙铝榴石 石榴石 石墨 光谱学 

分 类 号：TS93[轻工技术与工程]