铁铝榴石表面坑洞内一种异相材料的红外光谱证据

铁铝榴石表面的光泽差异可作为其是否经过了充填处理的重要证据之一,但需要辨别其成因是天然矿物包裹体出露还是人工注入材料所致。采用常规的宝石学测试方法和红外光谱技术分析了铁铝榴石样品的宝石学特征及其表面弱光泽材料的红外光谱特征,获得了其是否经过充填处理的关键证据。结果表明,显微红外反射光谱中1 200~900 cm-1范围内的谱带以及798,779 cm-1处的吸收峰表明铁铝榴石中的异相材料为石英矿物包裹体,而不是油、树脂、蜡、玻璃等人工充填物。因此,铁铝榴石表面有弱光泽材料的存在不能简单视为其经过充填处理的关键证据,其表面存在的矿物包裹体可能是引起石榴石光泽变化的原因之一。

Infrared Spectral Proof of An Out-of-phase Material on Surface Cavity of Almandine

The luster difference on surface cavity of almandine is one of the important proofs for whether the almandine is filled by artificial materials or not.However,it is necessary to identify whether the luster difference origins from the surface-reaching natural mineral inclusions or not.The gemmological characteristics of almandine samples and surface material being weak luster with infrared spectral characteristics are studied by using the conventional gemmological methods and infrared spectrometer,which could determine whether the almandine samples have been filled or not.The results show that the microscope reflectance infrared spectra of the out-of-phase material have apparent absorption peaks at 1 200 to 900,798,779 cm-1,which verify the existence of the natural quartz inclusion instead of artificial fillings.The surface-reaching material being weak luster is not the diagnostic evidence for whether the almandine has been filled or not,while the existence of mineral inclusion may lead to the different luster on the surface of almandine.