| 三种仿寿山“坑头冻”印材的宝石矿物学特征 |
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| 引用本文： | 陈琼,周征宇,姚春茂,袁媛,支颖雪.三种仿寿山“坑头冻”印材的宝石矿物学特征[J].地质科学译丛,2012(1):7-13. |
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| 作者姓名： | 陈琼 周征宇 姚春茂 袁媛 支颖雪 |
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| 作者单位： | [1]同济大学海洋与地球科学学院,上海200092 [2]同济大学宝石及工艺材料实验室,上海200092 [3]金玉满堂珠宝行,福建福州350001 |
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| 摘 要： | 为研究缅甸翡翠中的哪些部位适合做烧红处理以及该部位能被烧红的原因,采用加热实验、偏光显微镜、红外光谱及差热分析方法对缅甸翡翠样品的原生部位、雾部位的加热前、后的特征进行了测试与分析。结果显示,翡翠中的蓝雾部位及黄雾部位适合做烧红处理,原生部位不适合烧红处理,蓝雾部位可以被烧成黄色及红色,黄雾部位可以被烧成红色。雾部位适合用来做烧红处理的原因在于,在低温的加热条件下,蓝雾部位中的大量的Fe2＋发生价态变化,实现由绿泥石向针铁矿的转变所导致,该过程由表及里逐步进行。原生部位的主要矿物硬玉需被加热更高的温度,在破坏其晶格的情况下,才可以呈现出红色,且该红色不具有褐色调。
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| 关 键 词： | “坑头冻” “青海白” “丹东白” “岩门晶” 地开石 斜绿泥石 |
Gemmological and Mineralogical Characteristics of Three Seal Stones that Imitate Shoushan ＂Kengtoudong＂ |
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| Authors: | CHEN Qiong ZHOU Zheng-yu YAO Chun-mao YUAN Yuan ZHI Ying-xue |
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| Institution: | 1.Ocean and Earth Science School,Tongji University,Shanghai 200092,China; 2.Laboratory of Gems and Technological Materials,Tongji University,Shanghai 200092,China; 3.Jinyumantang Jewelry Company,Fuzhou 350001,China) |
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| Abstract: | Shoushan ＂Kengtoudong＂ is a typical stone of Shoushan puddle stone which is rare and expensive.By XRD,FTIR,ICP-MS,SEM and other instruments,mineral component,chemical composition,microstructure of ＂Qinghaibai＂＂Dandongbai＂ and ＂Yanmenjing＂ are investigated systematically when they appear on the market recently as the imitation of Shoushan ＂Kengtoudong＂.The results show that ＂Kengtoudong＂ is mainly composed of dickite,observed with typical ＂Luobosiwen＂,and a higher percentage of Fe in chemical composition might result from its pyrite inclusions.＂Qinghaibai＂ is mainly composed of gypsum,which is of lower hardness.＂Dandongbai＂ is mainly composed of clinochlore,and dark green speckle impurities lead to dusky appearance.＂Yanmenjing＂ is mainly composed of dickite and higher V and Cr might be the reason that the stone show limegreen tones.SEM observation shows that Shoushan ＂Kengtoudong＂ samples have a high degree of crystallization with false hexagonal flake structure.The crystals plate of ＂Qinghaibai＂ is of large granularity,thickness and loose accumulation,thus it can be easily distinguished from others.The lamellar crystal of clinochlore of ＂Dandongbai＂ is thin and piled up closely,flex developed,thus it is smooth to the touch.The microscopical features of ＂Yanmenjing＂ are much like Shoushan ＂Kengtoudong＂,but its crystal degree is a little lower.The stones mentioned above are different in colour,luster,weighting and inclusions,due to their different mineral components and chemical compositions. |
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| Keywords: | ＂Kengtoudong＂ ＂Qinghaibai＂ ＂Dandongbai＂ ＂Yanmenjing＂ dickite clinochlore |
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