尼日利亚锌尖晶石的宝石矿物学及包裹体特征研究-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

尼日利亚锌尖晶石的宝石矿物学及包裹体特征研究

Gem mineralogy and inclusion characteristics of gahnite from Nigeria

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DOI	10.20086/j.cnki.yskw.2024.0310
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2024, 43(3)
作者	陈仪方，金雪萍，刘子琪，周征宇*，郑浚豪，管琪韵，陈琦,
作者单位	1. 同济大学海洋地质国家重点实验室, 上海 200092; 2. 同济大学海洋与地球科学学院, 上海 200092; 3. 同济大学人文学院, 上海 200092; 4. 同济大学宝石及工艺材料实验室, 上海 200092
摘要	采用常规宝石学测试、电子探针、单晶X射线衍射和拉曼光谱等方法,深入分析了尼日利亚锌尖晶石的常规宝石学特征、化学成分、晶体结构以及包裹体特征。尼日利亚锌尖晶石呈完好的八面体晶形,强玻璃光泽、半透明,相对密度为4.48~4.61,折射率为1.792~1.794,紫外荧光灯下呈惰性。通过电子探针测试,计算其化学式为Zn_(0.87~0.92)Fe_(0.06~0.07)Al_(1.98~2.01)O₄。单晶X射线衍射揭示其为立方晶系、空间群Fd3m,晶胞参数a=8.089(2)Å,四面体键长T—O=1.953(4)Å,八面体键长M—O=1.912 9(19)Å。锌尖晶石的特征拉曼吸收峰位于418 cm^-1和659 cm^-1,分别对应E_g模式、高频T_2g(3)模式。包裹体研究显示锌尖晶石含有多种矿物包体,包括闪锌矿、钠长石、白云母、石英、绿柱石、锆石和硅铍石,结合前人研究认为尼日利亚锌尖晶石形成于富Li、Cs、Rb、Be和Ta等元素的花岗伟晶岩中。
Abstract	The conventional gemological properties, chemical composition, crystal structure, and inclusions composition and characteristics of the Nigerian gahnite were analyzed in depth by conventional gemological testing, electron probe, single crystal X-ray diffraction, and Raman spectroscopy. The gahnite exhibits well-preserved octahedral crystal morphology, strong vitreous luster, and semi-transparency, with a relative density ranging from 4.48 to 4.61 and a refractive index of 1.792 to 1.794, displaying inert fluorescence under ultraviolet light. The electron probe analysis determined its chemical formula as Zn_(0.87~0.92)Fe_(0.06~0.07)Al_(1.98~2.01)O₄. Single-crystal X-ray diffraction revealed a cubic crystal system with space group Fd3m, lattice parameter a=8.089(2)Å, tetrahedral bond length T—O=1.953(4)Å, and octahedral bond length M—O=1.912 9(19)Å. Characteristic Raman absorption peaks for gahnite were identified at 418 cm^-1 and 659 cm^-1, corresponding to the E_g mode and high-frequency T_2g(3) mode, respectively. Raman spectroscopy of inclusions confirmed the presence of various minerals in gahnite, including sphalerite, albite, muscovite, quartz, beryl, zircon, and phenacite. Combined with previous studies, it is believed that gahnite in Nigeria is formed in granite-pegmatite rich in Li, Cs, Rb, Be and Ta.
关键词	锌尖晶石；宝石学；矿物学；包裹体特征
KeyWord	gahnite; gemology; mineralogy; inclusion characteristics
基金项目
页码	619-629

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陈仪方，金雪萍，刘子琪，周征宇*，郑浚豪，管琪韵，陈琦. 尼日利亚锌尖晶石的宝石矿物学及包裹体特征研究 [J]. 岩石矿物学杂志. 2024; 43; (3). 619 - 629.

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