特殊变色蓝宝石的宝石学特征研究

陈超洋; 邵天; 黄伟志; 沈澈; 李志彬; 沈锡田

doi:10.15964/j.cnki.027jgg.2019.S1.005

特殊变色蓝宝石的宝石学特征研究

1.
中国地质大学珠宝学院，湖北武汉 430074
2.
北京科技大学土木与资源工程学院，北京100083

详细信息

作者简介:
陈超洋(1995-)，男，硕士研究生，主要从事宝石学方面的研究

通讯作者:
沈锡田(1962-)，男，教授，主要从事宝石学及矿物学研究工作。E-mail: ahshen@foxmail.com

中图分类号: P575.4;TS93
计量
- 文章访问数: 337
- HTML全文浏览量: 178
- PDF下载量: 31
出版历程
- 收稿日期: 2019-09-12
- 刊出日期: 2019-09-30

Gemmological Characteristic of A Special Colour-Changed Sapphire

1.
Gemmological Institute, China University of Geosciences, Wuhan 430074, China
2.
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 本文研究样品是一颗产自坦桑尼亚、具有特殊变色效应的蓝宝石，重8.86 ct，尺寸为10.59×13.82×6.35 mm，在D65光源(色温6 500 K)下呈现浅黄色，在A光源(色温2 856 K)下呈现浅紫红色。采用显微观察与拍照、激光拉曼光谱仪、傅里叶变换红外光谱仪、激光剥蚀电感耦合等离子体质谱仪和紫外-可见分光光度计针对这颗变色蓝宝石中的内含物种类、微量元素、颜色与变色成因、荧光等宝石学特征进行测试分析。显微观察显示，该特殊变色效应蓝宝石样品中含有大量片状、针状且具有金属光泽的包裹体和无色透明柱状聚成簇的晶体包裹体，拉曼光谱测试其分别为金红石和锆石；红外光谱测试显示，样品中存在高岭石的OH峰，说明其含有高岭石包裹体，但在显微镜下难以观察；该特殊变色效应蓝宝石样品的微量元素主要有Cr、V、Ti、Mg、Fe等；紫外-可见光谱中，该蓝宝石样品存在一个以560 nm为中心的宽缓吸收带，该吸收带由Cr和V造成，导致蓝宝石的变色效应。样品具有红色荧光，结合光致发光光谱与微量元素结果，红色荧光是由Cr造成。
- 蓝宝石 /
- 变色效应 /
- 内含物 /
- 宝石学特征 /
- 坦桑尼亚
Abstract: The sample in this study is a sapphire with special colour-change effect, which is from Tanzania. The sample weighs 8.86 ct and has a size of 10.59×13.82×6.35 mm. Its appearance shows light yellow under D65 light source (colour temperature 6 500 K) and light purple red under a light source (colour temperature 2 856 K). This study mainly focused on the gemmological characteristics of this sapphire sample, such as inclusions, trace elements, origin of colour and colour-changed effect, fluorescence characteristics, etc. Microscopic observation and photomicrograph, Raman spectrometer, Fourier transform infrared spectrometer, laser ablation inductively coupled plasma mass spectrometry and ultraviolet-visible spectrometer were used to test the sapphire sample. The results show that a large number of flake, needle-like inclusions with metallic luster and colourless transparent columnar crystalline inclusions can be observed under the microscope. They are identified as rutile and zircon respectively by Raman spectroscopy. There are OH peaks of kaolinite in the FTIR spectrum of this sapphire, where contains kaolinite inclusions that is difficult to observe under the microscope. The main trace elements are Cr, V, Ti, Mg, Fe. In the UV-Vis spectrum, there is an absorption band centered at 560 nm, which causes the colour-changed effect. This absorption band is caused by Cr and V. The sample has red fluorescence and red fluorescence is caused by Cr according to the PL spectrum and trace elements.
- sapphire /
- colour-changed effect /
- inclusion /
- gemmological characteristic /
- Tanzania

HTML全文

图 1 D65下蓝宝石样品的颜色(a)、A光源下蓝宝石样品的颜色(b)和紫外荧光灯下蓝宝石样品的颜色(c)(陈超洋拍摄)

Figure 1. Colour of sapphire sample respectively under D65 light source (a), under light source A (b) and under ultraviolet fluorescence (c) (Photo by Chen Chaoyang)

下载: 全尺寸图片幻灯片

图 1 D65下蓝宝石样品的颜色(a)、A光源下蓝宝石样品的颜色(b)和紫外荧光灯下蓝宝石样品的颜色(c)(陈超洋拍摄)

Figure 1. Colour of sapphire sample respectively under D65 light source (a), under light source A (b) and under ultraviolet fluorescence (c) (Photo by Chen Chaoyang)

下载: 全尺寸图片幻灯片

参考文献(1)

[1]	陈超洋, 黄伟志, 邵天, 等. 特殊变色蓝宝石的紫外-可见光光谱研究[J]. 光谱学与光谱分析, 2019, 39(8): 2 470-2 473. https://www.cnki.com.cn/Article/CJFDTOTAL-GUAN201908029.htm