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中南大学学报(自然科学版)

Journal of Central South University

第29卷    第2期    总第120期    1998年4月

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文章编号:(1998)02-9-5
浙江雷甸淡水珍珠矿物成分特征
马红艳;袁奎荣;邓燕华;高岩

(中南工业大学资源环境与建筑工程学院)

摘 要: 研究了矿物成分的差异对淡水珍珠质量的影响.采用光学显微镜观察珍珠显微特征;采用粉晶X射线衍射仪测物相组成;用红外显微镜微区分析观察了珍珠物相组成的空间分布特征.结果发现,淡水珍珠物相组成与海水珍珠不同;并首次在淡水无光珠中发现了球文石.优质珍珠由单一的文石组成,未观察到方解石或球文石;无光珠有通体无光与部分无光2种,其中球文石与文石的含量随无光珠的种类不同而发现变化.自然界珍珠中球文石粉晶衍射强线D值由强至弱排列为3.226,2.723,3.553,1.811,2.057.球文石的含量、矿物颗粒的大小、排列方式、空间分布位置以及珍珠层的杂质含量是影响珍珠品质(颜色、透明度、光泽)的主要因素.

 

关键字: 矿物成分;球文石;淡水珍珠;宝石学;浙江

MINERAL CHARACTERISTICS OF LEIDIAN FRESH WATER PEARL, ZHEJIANG
Ma Hongyan Yuan Kuirong Deng Yanhua Guao Ya

College of Resources,Environment and Civil Engineering,Central South University of Technology,Changsha,410083,China

Abstract:This paper shows that different mineral compositions affect the quality of fresh water pearl.The microscopic characteristics of fresh water pearl were observed by optical microscopy.The mineral compositions were measured by X ray diffraction.The space distribution of mineral in pearl was observed and measured with the most advanced microscopic infrared spectroscopy.The results show that the mineral compositions of fresh water pearl are different from that of sea water pearl,and vaterite has been discovered in the lusterless fresh water pearl for the first time.The high quality fresh water pearls are composed of aragonite,but calcite or vaterite has not been observed.The content of vaterite and aragnite in lusterless pearl varys with the kind of lusterless pearl.The X ray diffraction data of vaterite in fresh water lusterless pearl mainly are 3.226,2.723,3.553,1.811,2.057. The main factors affecting the quality of pearl(color,transparency,luster) are the content of vaterite, the grain size of mineral, the arrangement way of mineral, the space distribution of mineral and the impurity content of pearl lay.  

 

Key words: mineral compositions; vaterite; fresh water pearl; gemology; Zhejiang

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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