Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar

This paper employs an X-ray powder crystal diffractometer (XRD), an X-ray fluorescence spectrometer (XRF), an ultraviolet-visible-near infrared spectrometer (UV-Vis-NIR), a Fourier infrared spectrometer (FTIR), and a laser Raman spectrometer to systematically investigate the gemological characterist...

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Autores principales:	Siming Chen, Honglin Tan, Cun Zhang, Yajun Teng, Endong Zu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	sapphire gemological characteristics spectroscopy Baw-mar mine Myanmar Crystallography QD901-999
Acceso en línea:	https://doaj.org/article/75db332d71584234910916b074fd95f6
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spelling	oai:doaj.org-article:75db332d71584234910916b074fd95f62021-11-25T17:17:35ZStudy on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar10.3390/cryst111112752073-4352https://doaj.org/article/75db332d71584234910916b074fd95f62021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4352/11/11/1275https://doaj.org/toc/2073-4352This paper employs an X-ray powder crystal diffractometer (XRD), an X-ray fluorescence spectrometer (XRF), an ultraviolet-visible-near infrared spectrometer (UV-Vis-NIR), a Fourier infrared spectrometer (FTIR), and a laser Raman spectrometer to systematically investigate the gemological characteristics of blue sapphires from Baw-mar mine, Mogok, Myanmar. The results show that the FTIR spectra and UV-Vis-NIR spectra of the sapphire from this mine are significantly different from those of sapphires from other origins, which can be used to identify sapphires from this mine. The main crystal structure of the mineral sapphire from Baw-mar mine is corundum. The predominant chemical elements are Al and O, and the color-causing elements are Fe, Ti, V, and Ni. The characteristic ultraviolet absorption peak appears at 418 nm, which is mainly caused by the d-d transition of V<sup>3+</sup> ions. The intensity change of the 946 nm ultraviolet absorption peak indicates that the presence of Ni<sup>2+</sup> ions may aggravate the gray tone of sapphire and reduces its transparency. Compared with sapphires from other origins, sapphires from this mine have three characteristic infrared peaks of kaolinite at 930, 1025, and 1110 cm<sup>−1</sup>, of which the single peak at 930 cm<sup>−1</sup> is attributed to -OH translation, and the double peaks at 1025 and 1110 cm<sup>−1</sup> are attributed to the Si-O stretching vibration. The peaks at 369, 410, 437, 565, 633, and 739 cm<sup>−1</sup> in the Raman spectra are attributed to [AlO<sub>6</sub>] octahedron vibration. Our work provides insight into detailed spectroscopy data of blue sapphires from this mine and the identification of sapphires from different origins through spectroscopic characteristics.Siming ChenHonglin TanCun ZhangYajun TengEndong ZuMDPI AGarticlesapphiregemological characteristicsspectroscopyBaw-mar mineMyanmarCrystallographyQD901-999ENCrystals, Vol 11, Iss 1275, p 1275 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	sapphire gemological characteristics spectroscopy Baw-mar mine Myanmar Crystallography QD901-999
spellingShingle	sapphire gemological characteristics spectroscopy Baw-mar mine Myanmar Crystallography QD901-999 Siming Chen Honglin Tan Cun Zhang Yajun Teng Endong Zu Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar
description	This paper employs an X-ray powder crystal diffractometer (XRD), an X-ray fluorescence spectrometer (XRF), an ultraviolet-visible-near infrared spectrometer (UV-Vis-NIR), a Fourier infrared spectrometer (FTIR), and a laser Raman spectrometer to systematically investigate the gemological characteristics of blue sapphires from Baw-mar mine, Mogok, Myanmar. The results show that the FTIR spectra and UV-Vis-NIR spectra of the sapphire from this mine are significantly different from those of sapphires from other origins, which can be used to identify sapphires from this mine. The main crystal structure of the mineral sapphire from Baw-mar mine is corundum. The predominant chemical elements are Al and O, and the color-causing elements are Fe, Ti, V, and Ni. The characteristic ultraviolet absorption peak appears at 418 nm, which is mainly caused by the d-d transition of V<sup>3+</sup> ions. The intensity change of the 946 nm ultraviolet absorption peak indicates that the presence of Ni<sup>2+</sup> ions may aggravate the gray tone of sapphire and reduces its transparency. Compared with sapphires from other origins, sapphires from this mine have three characteristic infrared peaks of kaolinite at 930, 1025, and 1110 cm<sup>−1</sup>, of which the single peak at 930 cm<sup>−1</sup> is attributed to -OH translation, and the double peaks at 1025 and 1110 cm<sup>−1</sup> are attributed to the Si-O stretching vibration. The peaks at 369, 410, 437, 565, 633, and 739 cm<sup>−1</sup> in the Raman spectra are attributed to [AlO<sub>6</sub>] octahedron vibration. Our work provides insight into detailed spectroscopy data of blue sapphires from this mine and the identification of sapphires from different origins through spectroscopic characteristics.
format	article
author	Siming Chen Honglin Tan Cun Zhang Yajun Teng Endong Zu
author_facet	Siming Chen Honglin Tan Cun Zhang Yajun Teng Endong Zu
author_sort	Siming Chen
title	Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar
title_short	Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar
title_full	Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar
title_fullStr	Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar
title_full_unstemmed	Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar
title_sort	study on gemological characteristics of blue sapphires from baw-mar mine, mogok, myanmar
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/75db332d71584234910916b074fd95f6
work_keys_str_mv	AT simingchen studyongemologicalcharacteristicsofbluesapphiresfrombawmarminemogokmyanmar AT honglintan studyongemologicalcharacteristicsofbluesapphiresfrombawmarminemogokmyanmar AT cunzhang studyongemologicalcharacteristicsofbluesapphiresfrombawmarminemogokmyanmar AT yajunteng studyongemologicalcharacteristicsofbluesapphiresfrombawmarminemogokmyanmar AT endongzu studyongemologicalcharacteristicsofbluesapphiresfrombawmarminemogokmyanmar
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Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar

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