粉红色绿柱石的谱学特征和颜色成因分析

Analysis of Spectral Characteristics and Color Genesis of Pink Beryl

粉红色绿柱石又称作摩根石,其作为绿柱石族中较少见的一个品种,在市场上并不多见。粉红色绿柱石是属于绿柱石家族中较具价值的宝石之一。但是,由于粉红色绿柱石的问世比较晚,所以人们对其认知度还比较低,对其颜色成因的研究十分有限,本文旨在探索其谱学特征和颜色形成机制。此次论文共收集了六块样品进行研究,包括五块天然粉红色绿柱石和一块水热法合成红色绿柱石。对五件天然样品进行了宝石学特征测试,对所有样品进行了大型仪器测试,包括傅立叶红外光光谱仪,激光拉曼光谱仪,紫外可见光分光光度计和X射线荧光光谱分析测试。实验结果显示,水热法合成绿柱石颜色为深红色,不含Cs ,其余五块天然样品颜色为粉色调和橙粉色调,都含有Cs 。Mn2 和Cs 一起替代Al3 是粉红色绿柱石呈现粉色调的重要原因。橙色样品因为含有Fe2 离子,而呈现黄褐色,再与粉红色混合使得颜色综合形成橙粉色。水热法合成红色绿柱石的颜色为深褐色,是加了大量的Fe2O3和MnO2的缘故,没有添加Cs ,所以没有呈现出粉色调。

Ink beryl, also known as morganite, as a rare species of beryl family, in the market is not much seen. Morganite is one of the most valuable gems in the beryl family. Because pink beryl came out relatively late, people’s recognition of it is still relatively low, and the research on its color genesis is very limited. This paper aims to explore its spectral characteristics and color formation mechanism. Six samples were collected for testing, including five natural pink beryl and one hydrothermal synthetic red beryl. The gemological characteristics of five natural samples were identified, and all samples were tested by large-scale instruments, including Fourier infrared spectrometer, laser Raman spectrometer, UV-VIS spectrophotometer, and X-ray fluorescence spectroscopic analysis. The experimental results show that the color of beryl synthesized by hydrothermal method is dark red and does not contain Cs , and the other five natural samples are pink and orange pink, all containing Cs . The substitution of Mn2 and Cs for Al3 is an important reason for the pink tone of pink beryl. The orange sample is yellowish brown because it contains Fe2 ions, and then mixed with pink to form orange pink. The color of red beryl synthesized by hydrothermal method is dark brown, which is due to the addition of a large amount of Fe2O3 and MnO2, and there is no Cs , so it does not show a pink tone.