| In the past thirty years,the popularity of jadeite has been continuous,and the market demand has been increasing.As a source of high-quality jadeite,Myanmar is increasingly scarce in resources,resulting in fewer high-quality jadeite.As a result,the quality of jadeite has always been a hot topic of concern.This article will focus on Myanmar jadeite,which is mainly composed of jadeite,and conduct a detailed study on the macroscopic and microstructural characteristics of jadeite with different textures.Modern testing techniques will be further used to explore the relationship between jadeite structure and texture,and the evolution of its formation process will be inferred through microstructural changes.Furthermore,the quality evaluation and genesis analysis of jadeite will be conducted.The main research findings of the paper are as follows:1.The microstructure characteristics reflected by the four major types of textures with different qualities are different:(1)Poor jadeite: manifested as coarse-grained crystalline structure and fragmented structure;(2)General jadeite: manifested as a metamorphic crystalline structure,with localized display of metamorphic fragmentation,deformation,and fine-grained structures;(3)Good jadeite:characterized by metamorphic fine-grained crystallization and fine-grained metamorphic recrystallization structure;(4)Very good jadeite: exhibiting a metamorphic recrystallization structure.2.By using modern testing techniques such as infrared spectroscopy and electron probe analysis,it can be concluded that:1)In the analysis of samples with different textures,both infrared spectroscopy and electron probe testing showed that the main mineral component was jadeite.2)Composition analysis shows that the fine crystalline structure in the sample has an increase in Ca,Fe,and Mg compared to the early crystalline structure;There is a slight increase in Ca,Fe,and Mg in the recrystallized large particle area of jadeite structure compared to the recrystallized small particle area at a later time;The green fine-grained area in jadeite has higher Ca,Fe,Mg,and Cr than the white large particle area.It is speculated that during the evolution process of jadeite from diagenetic stage to jadeite stage,due to metamorphic differentiation or the addition of foreign fluid substances,chromogenic elements such as Ca,Fe,Mg,Cr have been enriched,which is also one of the reasons for the appearance of green.3)In the micro test analysis,the trend characteristics of the rare earth element distribution maps of each sample are generally consistent,with slightly rich light rare earth elements and Eu being in a positive anomaly,showing a right tilt overall;This reflects the overall process of jadeite formation,where the material sources have homology,and the formation of jadeite jadeite at different stages has certain correlation,homology,and inheritance.It also indicates that the formation of high-quality jadeite is closely related to crystal differentiation.3.According to the characteristics of microstructure,it reflects that the formation of jadeite jade has gone through the following processes: coarse grain metamorphic structure-metamorphic fragmentation and fine crystalline structure,metamorphic recrystallization structure,etc.,which reflects the process of Metamorphism:metamorphic crystallization-stress Metamorphism-metamorphic recrystallization.Among them,the jadeite mineral fragmentation caused by stress can not improve the quality of jadeite,but will reduce the quality of jadeite.Only the differentiation of fine crystallization and recrystallization caused by internal self adjustment in the process of stress Metamorphism is the key to improve the quality of jadeite.In addition,the addition of external fluid is also a factor to improve the quality of jadeite.The white cotton wool in jadeite is mainly the residue left by the early internal jadeite minerals during the process of fine crystallization and recrystallization. |
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