河南省伏牛山“梅花玉”的宝石矿物学特征

Gemmological and Mineralogical Characteristic of “Meihua Jade” from Funiu Mountain, Henan Province

  • 摘要: 河南省伏牛山"梅花玉"是近期珠宝市场较流行的一个玉石品种,主体呈灰绿色至灰黑色,因形似梅花故称"梅花玉"。通过常规的宝石学测试、偏光显微镜、傅里叶红外光谱仪、电子探针、X射线单晶衍射仪等测试方法对河南省伏牛山"梅花玉"样品进行宝石矿物学特征的研究与分析。结果显示,河南省伏牛山"梅花玉"结构较疏松,蜡状光泽—弱玻璃光泽,玉石内部空隙被多种矿物充填形成各式各样的杏仁体,相对密度为2.82;河南省伏牛山"梅花玉"为一种灰绿色的粗面岩,杏仁状构造,其基质主要由钠长石、钾长石和阳起石组成,为玻基交织结构。斑晶主要由钠长石和钾长石组成,杏仁体主要由长石、石英、绿帘石、绿泥石、岩屑、方解石等矿物组成。

     

    Abstract: A kind of greyish-green to greyish-black "Meihua jade" has been newly found in Funiu Mountain, Henan Province and it is called "Meihua jade" according to the surface pattern like plum blossom. In this paper, the gemmological and mineralogical characteristics of "Meihua jade" samples were tested by using the conventional gemmological methods, polarizing microscope, Fourier transform infrared spectroscopy, electron probe analysis and X-ray diffraction. The results showed that the "Meihua jade" from Funiu Mountain has loose structure, waxy luster to weak vitreous luster. The internal voids with different minerals called amygdule. The relative density of precious stone is 2.84. The "Meihua jade" from Funiu Mountain has amygdaloidal structure, and there are albite, K-feldspar and actinolite in the matrix being hyalopilitic texture. Meanwhile, the tests of polarizing microscope and EPMA showed that the phenocryst consists of albite with polysynthetic twin and K-feldspar with simple twin.Most importantly, the mineral association of amygdule is complicated with feldspar, quartz, epidote, chlorite, calcite, and detritus.

     

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