山东昌乐“类达碧兹”蓝宝石的谱学特征探究

doi:10.3964/j.issn.1000-0593(2023)04-1199-06

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摘要： “达碧兹”宝石具有由内含物或者致色元素的分布不均导致的类似于“六射星光”的六方对称的特殊现象，具有该现象的宝石可成两类，即由内含物将主晶体分隔为不同区域而形成的“达碧兹”宝石，以及由于内部其他原因形成的外观上与“达碧兹”宝石近似的“类达碧兹”宝石。紫外可见近红外光谱显示四块样品中均出现的375与450 nm附近的几个窄吸收峰，均为Fe³⁺所产生的晶体场场谱。560 nm附近的宽吸收带则应当为Fe²⁺与Ti⁴⁺两种离子发生电荷转移时产生的电荷移动谱，这是在黄色蓝宝石之外绝大部分蓝宝石中都会出现的吸收带。拉曼（Raman）光谱测试发现，在具有“类达碧兹”图样的山东蓝宝石内部的各个部位的矿物相均为刚玉相。其拉曼位移峰集中于位于在378、417及576 cm^-1等处，证明其并没有被矿物包裹体分隔为不同的生长区域，应当属于“类达碧兹”系列。能量色散型X射线荧光光谱（EDXRF）分析测试发现其内部各处的铝元素含量远远高于其他元素，且符合刚玉矿物的理论值97%以上。激光剥蚀等离子体质谱（LA-ICP-MS）结果证实在的“核心”与“臂”等区域Fe、Ti等微量元素含量均明显高于其他元素，造成了上述区域的颜色加深。山东“类达碧兹”蓝宝石出现“类达碧兹”图样的原因是致色元素差异分布导致的，故而仍然属于“类达碧兹”系列。

关键词：“类达碧兹”蓝宝石；紫外-可见-近红外光谱测试；激光拉曼光谱；X射线荧光光谱；激光剥蚀等离子体质谱

Abstract：“Trapiche” gemstone has a special phenomenon of hexagonal symmetry similar to “six starlight” caused by the uneven distribution of inclusions or chromogenic elements. Gemstones with this special phenomenon can be divided into two different types, one kind is the “trapiche” gemstone, which is formed by separating the main crystal into different regions by inclusions. The other is a “trapiche-like” gemstone, which looks like the “trapiche” gemstone because of its internal reasons. UV-VIS-NIR spectroscopy shows that the main absorption peaks are dominated by 375 and 450 nm, which induced by Fe³⁺ and its crystal field spectrum. The wide absorption band near 560 nm should be the charge movement spectrum due to the charge transfer between Fe²⁺ and Ti⁴⁺ ions, which can be found in most colors of the sapphire except the yellow one. The mineral phases from the Raman spectrum in all parts of Shandong sapphire with a “trapiche-like” pattern are corundum phases. All Raman shift peaks are concentrated at 378, 417 and 576 cm^-1, confirming that sapphire crystal is not separated into different growth regions by mineral inclusions and it should belong to the “trapiche-like” type. EDXRF results confirm that the aluminum in sapphire is much higher than other elements and reaches the theoretical value of corundum mineral, more than 97%, which is consistent with the Raman results. LA-ICP-MS results show that the amount of Fe and Ti elements contained in the “core” and “arm” were significantly higher than that of another area, which can make these regions darken. Shandong Sapphire’s “trapiche-like” pattern is different distribution of coloring elements, the inclusions cannot divide main crystals into the different regions, and this ChangLe sapphire still belongs to the “trapiche-like” type.

Key words：Trapiche-like sapphire; UV-VIS-NIR spectra; Raman spectra; EDXRF; LA-ICP-MS

收稿日期: 2022-04-29 修订日期: 2022-09-23

中图分类号:

P575.4

基金资助: 国家重点研发计划项目(2018YFF0215400)，中国地质大学（武汉）珠宝检测技术创新中心项目(CIGTWZ-2021024)资助

通讯作者: 李妍 E-mail: yanli@cug.edu.cn

作者简介: 林静韬，1997年生，中国地质大学（武汉）珠宝学院硕士研究生 e-mail: 369060021@qq.com

引用本文:

林静韬，信辰星，李妍. 山东昌乐“类达碧兹”蓝宝石的谱学特征探究[J]. 光谱学与光谱分析, 2023, 43(04): 1199-1204.
LIN Jing-tao, XIN Chen-xing, LI Yan. Spectral Characteristics of “Trapiche-Like Sapphire” From ChangLe, Shandong Province. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(04): 1199-1204.

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