和田玉物质成分及结构类型对比研究

Comparative Study on Material Composition and Types of Structures of the Nephrite

通过对国内外主要和田玉品种化学成分、矿物组合、结构类型等方面的对比研究,系统地总结它们岩石矿物学特征的异同点,结果表明不同产地软玉品种的主化学成分和主要矿物相似,微量元素和次要组成矿物因产地和品种不同存在差异;软玉的结构类型主要包括毛毡状隐晶质变晶结构、显微鳞片—片状变晶结构、显微粒状—纤维状变晶结构及斑状变晶结构等。根据研究结果初步探讨不同产地和田玉品种物质成分和结构特征与其品质的内在联系,对和田玉的开发利用和质量鉴评有重要实际意义。

The chemical component, mineral assemblage and types of structure of nephrite from different area are com- pared. Similarity and distinction in their petrological and mineralogical characteristics are summarized systematically. The results show that the main chemical compositions and essential minerals of nephrite from different area are similar, but there are differences in trace element and the secondary minerals. The main mineral of nephrite is tremolite and com- mon structures include woven flet-like fiber structure, interlocking fibrocrystalloblastic texture, microfibro-aphanitie crys- talloblastic texture, microfibro flaky blastic texture, porphyroblastic texture, etc. According to preliminary discussion on the material composition and structure characteristics of the different origin of nephrite with the intrinsic relationship of quality, the work are practical significance for development and utilization and quality of nephrite appreciation.