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Minerals 2017, 7(1), 3; https://doi.org/10.3390/min7010003

Reflectance Spectroscopy Characteristics of Turquoise

1
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2
National Key Laboratary of Science and Technology on Remote Sensing Information and Image Analysis, Beijing 100029, China
3
School of Gemmology, China University of Geosciences, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Academic Editors: David Phillips and David Chew
Received: 18 June 2016 / Revised: 2 December 2016 / Accepted: 21 December 2016 / Published: 30 December 2016
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Abstract

In this study, we determined the reflectance spectra of four types of turquoise with different hardness (porcelain, hard turquoise, soft turquoise, and loose turquoise) using an ASDTM TerraSpec spectrometer (spectral range 350–2500 nm, Visible-Near Infrared, and Short-wave Infrared). Several absorption features, including six narrow absorption peaks at 425 nm, 1480 nm, 2160 nm, 2218 nm, 2253 nm, and 2347 nm, and three wide peaks between 625–756 nm, 756–915 nm, and 1885–2133 nm have been identified. The strength of the absorption of turquoise increased with decreasing hardness. The absorption peaks at 2160 nm, 2218 nm, 2253 nm, 2347 nm, and 1885–2133 nm on some turquoise spectra (porcelain spectra, for example) were relatively weak, while those at 425 nm, 1480 nm, 625–756 nm, and 756–915 nm were always observed on all turquoise spectra, which could be the diagnostic absorption features for turquoise. Additionally, the hyper-spectral imaging (spectral range 1000–2500 nm, Short-wave Infrared) of the four types of turquoise were obtained using a HySpexTM imager. The Spectral Angle Mapper (SAM) method was successfully used to recognize turquoises, suggesting that hyper-spectral imaging may serve as a useful tool for fast turquoise identification and separation, especially for massive turquoise samples. View Full-Text
Keywords: reflectance spectroscopy; hyper-spectral imaging; turquoise; identification and separation reflectance spectroscopy; hyper-spectral imaging; turquoise; identification and separation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Qiu, J.-T.; Qi, H.; Duan, J.-L. Reflectance Spectroscopy Characteristics of Turquoise. Minerals 2017, 7, 3.

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