河南省汝阳梅花玉杏仁体的成分及光谱分析

The Composition and Spectral Analysis of the Amygdule of Ruyang Meihua Jade in Henan Province

梅花玉在我国拥有悠久的历史,因其表面具有类似梅花的图案而受到人们的喜爱。本文结合前人的研究资料,通过常规宝石学测试、X射线粉晶衍射、傅里叶变换红外光谱、拉曼光谱、电子探针等现代测试手段对河南汝阳梅花玉杏仁体的成分及光谱学特征进行了较为全面的研究。研究结果表明汝阳梅花玉是一种杏仁状安山岩,由基质、斑晶和杏仁体三部分组成。基质的主要成分为石英和钠长石;斑晶呈白色,主要成分为斜长石;杏仁体多呈球状、椭球状及不规则状,少数呈拉长的树枝状连接多个杏仁体,形成"梅花";大部分杏仁体边缘可见粉色或白色环带,主要矿物成分为石英、钠长石、钾长石、绿帘石及方解石,少数含有绿泥石。

Meihua jade,which is loved by people because of the plum blossom-like pattern on its surface,has a long history in China.Based on the research data of predecessors,this paper used conventional gemological tests,X-ray powder diffraction,Fourier transform infrared spectroscopy,Raman spectroscopy,electron probes analysis to test amygdule of Ruyang Meihua jade.The results show that Ruyang Meihua jade is an almond-shaped andesite composed of matrix,phenocryst and amygdule.The main components of the matrix are quartz and sodium feldspar.The phenocryst is white and the main component is plagioclase.Amygdules are mostly spherical,elliptic and irregular,and a few elongated branches run through multiple amygdules to form"plum blossom".Pink or white bands can be seen at the edges of most amygdules,forming a two-layer structure.The main mineral components are quartz,sodium feldspar,potassium feldspar,epidote and calcite,and a few contain chlorite.