Hemimorphite Imitation: Wollastonite Glass-Ceramic
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摘要: 近期，市场上出现了一种被称为“雪花异极矿”的异极矿仿制品，为查明其矿物组成，通过常规宝石学测试，结合能量色散X射线荧光光谱仪、红外光谱仪、拉曼光谱仪等大型仪器测试，对该材料的宝石学特征、谱学特征和致色成因进行了初步探究，并将其与异极矿等相似品进行了对比鉴别。研究结果表明，其具有较低的折射率（1.50）和低的相对密度（2.50左右），在宝石显微镜下显示硅灰石微晶玻璃特征的纤维状结构；红外光谱和拉曼光谱均显示玻璃相及硅灰石晶体的特征谱带，通过谱学特征可将其与异极矿等相似品进行区分；结合紫外-可见吸收光谱和X射线荧光光谱测试结果，推断该样品的蓝色是由Cu元素导致。Abstract: Recently, a kind of hemimorphite imitation named "Snow hemimorphite" appeared in the market.Gemmological characteristics, spectral characteristics and coloration mechanism were preliminarily studied with the help of conventional gemmological testing methods, energy dispersive X-ray spectroscopy, infrared spectroscopy, Raman spectroscopy and other large equipments in order to ascertain its components, and to compare with similar materials.The results showed that "Snow hemimorphite" had low refractive index (1.50), low specific gravity (2.50) and typical fibrous structure of wollastonite glass-ceramic, which was observed in the gemmological microscope.Infrared spectrum and Raman spectrum both showed typical spectral bands of glass and wollastonite.Besides, the "Snow hemimorphite" samples could be distinguished from hemimorphite and other similar materials through spectral characteristics.The results of UV-Vis spectroscopy and X-ray fluorescence spectroscopy revealed that the element Cu in the "Snow hemimorphite" sample caused the blue colour.
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Keywords:
- glass-ceramic /
- wollastonite /
- hemimorphite /
- imitation /
- fibrous structure
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