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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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

Received: 2022-04-29 Accepted: 2022-09-23

ZTFLH:

P575.4

Corresponding Authors: LI Yan E-mail: yanli@cug.edu.cn

Cite this article:

LIN Jing-tao,XIN Chen-xing,LI Yan. Spectral Characteristics of “Trapiche-Like Sapphire” From ChangLe, Shandong Province[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(04): 1199-1204.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2023)04-1199-06 OR https://www.gpxygpfx.com/EN/Y2023/V43/I04/1199