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Application of FTIR on the Study of Spectroscopic Characteristics on Emerald from Itabira, Brazile  

Lim, Ye-Won (Department of Geology, Kyungpook National University)
Jang, Yun-Deuk (Department of Geology, Kyungpook National University)
Kim, Jong-Rang (Department of Geology, Kyungpook National University)
Kim, Hyeong-Soo (Department of Earth Sciences Education, Kyungpook National University)
Kim, Jong-Gun (Department of Gemology, Daegu Polytechnic College)
Kim, Jeong-Jin (Department of Earth and Environmental Sciences, Andong National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.21, no.4, 2008 , pp. 355-364 More about this Journal
Abstract
Emerald deposit located on Itabira, Brazil is one of the major one in the world. We applied three different analytical approaches on Itabira emerald samples, (1) perpendicular to the c-axis, (2) parallel to the c-axis, (3) emerald pallet mixed with KBr, using Fourier Transform Infrared (FTIR) spectroscopy, to understand and compare spectroscopic characteristics of three Itabira emerald samples. Occurrence of $5,271\;cm^{-l}$ and $1,638\;cm^{-l}$ absorption peaks within $H_2O$-related range indicates that the samples belong to Type-II emerald. These emerald samples also display strong absorption peak generated from Type-IIa emerald preserving $H_2O-Na-H_2O$ sequence. $CO_2$- and Cl-related absorption peaks observed within specific range except for $H_2O$-related range. These observations and results suggest that FTIR analysis can be used for not on1y classification of emerald types, but also prediction of $Na_2O$ content within the emerald through comparison of relative peak intensity.
Keywords
Emerald; FTIR; Type classification; Spectroscopic characteristics;
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