黄绿色葡萄石的矿物学特征及谱学研究

人工晶体学报 ›› 2022, Vol. 51 ›› Issue (4): 723-729.

黄绿色葡萄石的矿物学特征及谱学研究

王倩倩^1,2, 郭庆丰^1,2, 葛笑^1,2

1.中国地质大学(北京)珠宝学院,北京 100083;
2.中国地质大学(北京)珠宝与矿物材料实验教学中心,北京 100083

收稿日期:2022-01-28 出版日期:2022-04-15 发布日期:2022-05-16
通讯作者: 郭庆丰,博士,副教授。E-mail:qfguo@cugb.edu.cn
作者简介:王倩倩(1996—),女,山西省人,硕士研究生。E-mail:2109190009@cugb.edu.cn
基金资助:
国家自然科学基金(41802040);中国地质大学(北京)珠宝学院实验室项目

Mineralogical Characteristics and Spectroscopy of Yellow-Green Prehnite

WANG Qianqian^1,2, GUO Qingfeng^1,2, GE Xiao^1,2

1. School of Gemmology, China University of Geosciences, Beijing 100083, China;
2. Jewelry and Mineral Materials Laboratory of Experimental Teaching Demonstration Center, China University of Geosciences, Beijing 100083, China

Received:2022-01-28 Online:2022-04-15 Published:2022-05-16

摘要/Abstract

摘要： 葡萄石可以以板状、片状、葡萄状、肾状、放射状或块状集合体的形式产出,因其美丽的外观和特殊的晶体结构,近年来受到了学者的广泛关注。本文通过电子探针、粉晶X射线衍射仪、傅里叶变换红外光谱仪、显微拉曼光谱仪、紫外可见分光光度计等仪器对黄绿色葡萄石的成分、结构及谱学特征进行了分析与探讨。葡萄石的主要致色元素为Fe,且Fe³⁺经常取代Al³⁺占据八面体配位,Fe²⁺经常取代Ca²⁺存在于空隙中。电子探针数据表明:Fe与Al的含量变化整体呈现负相关关系,Fe与Ca的含量变化也整体呈现负相关关系,Fe含量相对较高的样品其黄绿色调加深。XRD图谱和拉曼光谱的结果表明:在葡萄石中绿帘石以包裹体的形式存在。红外光谱和拉曼光谱表明葡萄石中存在硅氧四面体和铝氧八面体两种架构,紫外可见吸收光谱揭示了葡萄石的致色机理。本文对葡萄石的矿物学特征及谱学特征进行系统分析,为后续葡萄石的进一步研究提供思路与实验数据。

关键词: 葡萄石, 矿物学, 成分, 结构, 谱学特征, 致色机理

Abstract: Prehnite can be produced in the form of platy, schistose, botryoidalis, kidney, radial or massive aggregates. In recent years, prehnite has attracted the attention of many scholars due to its beautiful appearance and special crystal structure. In this paper, the composition, structure and spectral characteristics of yellow-green prehnite were investigated by the electron microprobe, powder X-ray diffractometer, fourier transform infrared spectrometer, micro-Raman spectrometer, and ultraviolet-visible spectrophotometer. The main chromogenic element of prehnite is Fe. Fe³⁺ often replaces Al³⁺ to occupy the octahedral coordination position, and Fe²⁺ often replaces Ca²⁺ into the lattice channel. The electron microprobe results show that the content changes of Fe and Al are negatively correlated as a whole, and the content changes of Fe and Ca are also negatively correlated as a whole. The samples with relatively high Fe content have a deeper yellow-green tone. XRD patterns and Raman spectra show that epidote exists in the form of inclusion in prehnite. Infrared and Raman spectra show that there are two framework of silicon-oxygen tetrahedron and aluminum-oxygen octahedron in prehnite. The UV-Vis absorption spectra reveal the chromogenic mechanism of prehnite. This paper systematically analyzes the mineralogical and spectral characteristics of prehnite, so as to provide ideas and experimental data for the further research of prehnite.

Key words: prehnite, mineralogy, composition, structure, spectral characteristic, chromogenic mechanism

中图分类号:

王倩倩, 郭庆丰, 葛笑. 黄绿色葡萄石的矿物学特征及谱学研究[J]. 人工晶体学报, 2022, 51(4): 723-729.

WANG Qianqian, GUO Qingfeng, GE Xiao. Mineralogical Characteristics and Spectroscopy of Yellow-Green Prehnite[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2022, 51(4): 723-729.

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