含管状“人造发”水晶的特征及鉴定

Characteristic and Identification of Crystal with Artificial Tubular "Hair" Inclusion

  • 摘要: 近期在国内市场上出现了一种具有天然愈合裂隙的水晶,外观酷似天然发晶。为了探究上述样品的真伪,采用常规宝石学测试手段,配合傅里叶红外光谱仪及X射线荧光光谱仪等设备对其进行观察和综合分析,发现样品主晶中同时存在天然包裹体和具有人造特征的管状包裹体。其中,管状包裹体在显微镜下可见高度平行化、外观呆板、管壁锋利或呈锯齿状、管内具有螺旋纹及橙红色、橙黄色充填物等人造特征,且充填物显示异常紫外荧光。红外光谱及X射线荧光光谱分析表明,其主晶为天然水晶,管状包裹体中的充填物为含颜料的乙烯-醋酸乙烯酯共聚物(EVA)。通过测试分析可知,该样品以天然水晶为原料,以人工方法进行“造发”,用来仿制天然发晶,其外观与天然发晶相似,极具欺骗性。因此,在对含“发”水晶鉴定时应对主晶和其“发”进行综合鉴别。

     

    Abstract: A new kind of hair crystal with artificial hair inclusion and natural fluid inclusions appeared in the domestic jewelry marke recently, which has a much alike appearance to the natural hair crystal. The gemmological, FTIR and XRF techniques were used to test the crystal sample with artificial hair inclusion. The results showed that natural fluid inclusions and artificial tubular inclusions were both found in the host crystal. The man-made features include high parallelism and stiff look of the tubular inclusions, sharp or jagged tube shape, spiral patterned tube surface, filling of orange powder, resin on the near surface with incomplete filling, filling powder liquation and ultraviolet fluorescence of the infilling matters. FTIR and XRF results showed that the host crystal is rock crystal and the filling is a mixture of pigment and ethylene-vinyl acetate copolymer (EVA). In conclusion, the imitators took natural rock crystal as the host crystal, and then used artificial hair as inclusions to imitate hair crystals. This new type of hair crystal imitation with artificial hair is similar to natural hair crystal. It is suggested that the identification of crystal with hair inclusions should not only include determination of the host crystal, but also the hair-like inclusions.

     

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