"雅安绿"图章石的宝石矿物学特征研究
Gemmological and Mineralogical Characteristics of Green Muscovite Seal Stone("Ya'an Green")
赵庄羽 1刘可心 1郑汉天 1陈涛1
作者信息
- 1. 中国地质大学(武汉)珠宝学院,湖北武汉 430074;湖北省珠宝工程技术研究中心,湖北武汉 430074
- 折叠
摘要
图章石普遍"缺蓝少绿","雅安绿"以其明艳的绿色成为近年图章石的重要品种,而迄今为止,关于"雅安绿"图章石相关报道较少,且易与其它绿色图章石相混淆,故本文对"雅安绿"图章石这一品种进行深入研究,为其鉴别提供一定的依据.主要采用X射线粉末衍射、拉曼光谱、扫描电子显微镜、电子探针及紫外-可见光谱对"雅安绿"图章石样品的矿物组成、微形貌特征、化学成分、颜色成因进行测试分析.结果表明,"雅安绿"图章石样品中的绿色基质的矿物组成为白云母,黄色杂质矿物组成主要为白云石和黄铁矿,并含少量的石英、磷灰石和金红石.扫描电子显微镜观察发现,"雅安绿"图章石样品中的白云母呈假六方片状,呈三维空间无序排列;可见自形黄铁矿及完全解理块状的白云石.紫外-可见光光谱分析认为,"雅安绿"图章石样品的翠绿色主要由白云母中微量元素Cr引起.
Abstract
Generally,blue or green seal stones are rare in nature.Green muscovite Ya'an seal stone(Ya'an green)with its vivid green colour has become an important variety of seal stones in recent years.So far,there are few reports about this kind of seal stone,and it is easy to be confused with other green seal stones.Therefore,an in-depth study on this seal stone variety was conducted,which could provide data reference for the identification of this kind of green seal stones.Samples of"green muscovite Ya'an seal stone"were investigated by X-ray diffractometer,Raman spectroscopy,electronic microprobe analysis,environmental scanning electron microscope and ultraviolet-visible spectroscopy to obtain its mineral compo-nents,micromorphological characteristics,chemical compositions and cause of colour forma-tion.XRD,Raman and electronic microprobe results show that the green parts of the seal stone samples are muscovite,and the yellow impurity minerals are mainly dolomite and py-rite with a small amount of quartz,apatite and rutile.Environmental scanning electron mi-croscope results show that the shape of muscovite is false hexagonal platelet arranged in a disorderly way in three dimensional space.The idiomorphic pyrite,and massive dolomite with perfect cleavage can be seen.Through UV-Vis analysis,it is speculated that the vivid green colour of the"Ya'an green seal stone"is mainly caused by Cr element in muscovite.
关键词
"雅安绿"/白云母/图章石/X射线粉末衍射/拉曼光谱/扫描电子显微镜/电子探针Key words
'Ya'an green"/muscovite/seal stone/XRD/Raman spectroscopy/SEM/elec-tron probe引用本文复制引用
基金项目
中央高校基本科研业务费专项中国地质大学(武汉)项目(CUGDCJJ202236)
出版年
2024
NETL
NSTL
万方数据