Characterization of Hydrous Mineral Inclusions in Ruby and Sapphire by Infrared Spectroscopy and Microscopic Confocal Laser Raman Spectroscopy

Pei-ying NING; Tian-yang ZHANG; Hong MA; Jun XIE; Ting DING; Hui-huang LI; Rong LIANG

doi:10.15898/j.cnki.11-2131/td.201903050033

2019 Vol. 38, No. 6

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Article navigation > Rock and Mineral Analysis > 2019 > 38(6): 640-648

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Pei-ying NING, Tian-yang ZHANG, Hong MA, Jun XIE, Ting DING, Hui-huang LI, Rong LIANG. Characterization of Hydrous Mineral Inclusions in Ruby and Sapphire by Infrared Spectroscopy and Microscopic Confocal Laser Raman Spectroscopy[J]. Rock and Mineral Analysis, 2019, 38(6): 640-648. doi: 10.15898/j.cnki.11-2131/td.201903050033

Citation:

Pei-ying NING, Tian-yang ZHANG, Hong MA, Jun XIE, Ting DING, Hui-huang LI, Rong LIANG. Characterization of Hydrous Mineral Inclusions in Ruby and Sapphire by Infrared Spectroscopy and Microscopic Confocal Laser Raman Spectroscopy[J]. Rock and Mineral Analysis, 2019, 38(6): 640-648. doi: 10.15898/j.cnki.11-2131/td.201903050033

Characterization of Hydrous Mineral Inclusions in Ruby and Sapphire by Infrared Spectroscopy and Microscopic Confocal Laser Raman Spectroscopy

1.
National Gemstone Testing Center Shenzhen Labortory, Shenzhen 518026, China
2.
National Gemstone Testing Center Shenzhen Labortory Company LTD, Shenzhen 518026, China
3.
NGTC Gems & Jewelry Institute of Shenzhen, Ministry of Natural Resources, Shenzhen 518026, China

More Information

Corresponding author: Tian-yang ZHANG, 643610016@qq.com

Received Date: 05 March 2019

Revised Date: 10 July 2019

Accepted Date: 16 July 2019

Abstract

Abstract

BACKGROUNDThere are water molecules and hydrous mineral inclusions in natural ruby and sapphire. The hydrous minerals disappear easily after heat treatment, which causes the physical and chemical properties of ruby and sapphire to change. Thus the hydrous mineral inclusions have important indications for identifying whether or not ruby and sapphire have been heated. OBJECTIVESTo analyze the characteristics of the hydrous mineral inclusions, and discuss the validity of the identification method for identifying whether or not ruby and sapphire have been heated through hydrous mineral inclusions. METHODSMineral inclusions were characterized by the gem microscope, infrared spectroscopy and microscopic confocal laser Raman spectroscopy. RESULTSThe hydrous mineral inclusions showed good shape and clear appearance. The infrared spectrum characteristics showed diaspore characteristic absorption peaks at 2105-2110cm^-1 and 1977-1985cm^-1, and kaolinite peaks at 3619cm^-1 and 3696cm^-1. The microscopic confocal laser Raman spectroscopy analysis showed the typical characteristic peaks of hydrous mineral inclusions such as amphibole, mica, apatite and feldspar. CONCLUSIONSThe features shown in the results reveal the water-containing characteristics of ruby and sapphire samples, which can be used to determine the natural rubies and sapphires without heat treatment.
- ruby /
- sapphire /
- hydrous mineral inclusions /
- spectrum characteristics /
- heat treatment /
- infrared spectroscopy /
- microscopic confocal laser Raman spectroscopy

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References

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