한국광물학회지 (Journal of the Mineralogical Society of Korea)

  • 제21권4호
  • /
  • Pages.355-364
  • /
  • 2008
  • /
  • 1225-309X(pISSN)
  • /
  • 2288-7172(eISSN)
한국광물학회 (The Mineralogical Society of Korea)
권호 표지

FTIR을 이용한 브라질 Itabira 지역 에메랄드의 분광학적 특성 연구

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

  • 임예원 (경북대학교 자연과학대학 지질학과) ;
  • 장윤득 (경북대학교 자연과학대학 지질학과) ;
  • 김종랑 (경북대학교 자연과학대학 지질학과) ;
  • 김형수 (경북대학교 사범대학 지구과학교육과) ;
  • 김종근 (대구산업정보대학 보석감정학과) ;
  • 김정진 (안동대학교 지구환경과학과)
  • 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)
  • 발행 : 2008.12.30
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초록

현재 에메랄드의 중요한 산지로 자리 잡아가고 있는 Itabira 지역 에메랄드의 분광학적 특성을 연구하기 위하여 에메랄드를 C-축에 수직, 수평인 방향으로 각각 절단하였으며, $H_2O$ 관련 범위의 좀더 세부적인 피크 관찰을 위하여 KBr로 압축한 pellet시료를 만들어 적외선 분광분석(FTIR) 실험을 수행하였다. $H_2O$ 관련 범위에서 $5,271\;cm^{-1}$, $1,638\;cm^{-1}$ 피크가 나타나는 것으로 보아 본 시료는 Type-II에 해당함을 관찰할 수 있었으며, $H_2O-Na-H_2O$ 배열 형태를 가지는 Type-IIa에 해당하는 피크가 아주 강하게 나타나고 있다. $H_2O$ 관련 범위를 제외한 특정 범위에서는 $CO_2$, Cl 피크 등이 관찰되었으며, 적외선 분광분석 법을 이용하여 타입의 분류뿐만 아니라 상대적인 피크 강도 비교를 통하여 $Na_2O$ 함량 또한 예측 가능한 것으로 사료된다.

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.

키워드

참고문헌

  1. 김원사 역 (1993) 보석 내포물. 춘광, 서울, 532p
  2. 문석식, 박만기, 이용문, 조정혁 (2000) 분광학적 분석 입문. 자유 아카데미, 서울, 558p
  3. Aurisicchio, C., Grubessi, O., and zecchini, P. (1994) Infrared spectroscopy and crystal chemistry of the beryl group. Canadian Mineralogist, 32, 55-68
  4. Belov, N.V. and Matveeva, R.G. (1950) Determination of the parameters of beryl by the method of partial projection. Dokl. Akad. Nauk. SSSR, 73, 299-302
  5. Bernard Charoy, Philippe de Donato, Odile Barres, and Cristina Pinto-Coelho (1996) Channel occupancy in an alkali-poor beryl from Serra Branca (Goias, Brazil): Spectroscopic characterization. American Mineralogist, 81, 395-403 https://doi.org/10.2138/am-1996-3-414
  6. Bragg, W.L. and West, J. (1926) The structure of beryl. Proc, Roy, Soc, London, A111, 691-714
  7. Bragg, W.L. and Claringbull, G.F. (1965) Crystal structures of minerals, Bell and Sons Ltd, London, 213p
  8. Damon, P.E. and Kulp, J.L. (1958) Excess helium and argon in beryl and other minerals. American Mineralogist, 43, 433-459
  9. Giuliani, G. et al. (2002) Emeralds of the World. extraLapis English No. 2: The Legendary Green Beryl, 100p
  10. Gibbs, G.V., Breck, D.W., and Meagher, E.P. (1968) Structural refinements of hydrous and anhydrous synthetic beryl, $Al_2(Be_3Si_6)O_{18}$ and emerald $Al_{1.9}Cr_{0.1}(Be_3Si_6)O_{18}$. Lithos, 1, 275-285 https://doi.org/10.1016/S0024-4937(68)80044-1
  11. Kodaira, K., Iwase, Y., Tsunashina, A., and Matsushita, T. (1982) High pressure hydrothermal synthesis of beryl crystals, Journal of crystal growth, 60, 172-174 https://doi.org/10.1016/0022-0248(82)90193-2
  12. Lodzinski, M., Sitarz, M., Stec, K., Kozanecki, M., Fojud, Z., and Jurga, S. (2005) ICP, IR, Raman, NMR investigations of beryls from pegmatites of the Sudety Mts. Journal of Molecular Structure, 744-747, 1005-1015 https://doi.org/10.1016/j.molstruc.2004.12.042
  13. Nakamoto, K. (1963) Infrared spectra of inorganic and coordination compounds. Wiley, New York, 328p
  14. Nassau, K. (2001) The physics and chemistry of color. John Wiley&Sons, New York, 481p
  15. Nesse, W. (2004) Optical mineralogy. Oxford university press, New York, 348p
  16. Preinfalk, Kostitsyn, Y., and Morteani, G. (2002) The pegmatites of the Nova Era-Itabira-Ferros pegmatite district and the emerald mineralisation of Capoeirana and Belmont(Minas Gerais, Brazil) : Geochemistry and Rb-Sr dating. Journal of south American Earth Sciences, 14, 867-887 https://doi.org/10.1016/S0895-9811(01)00082-7
  17. Schmetzer, K. and Kiefer, L. (1990) Water in beryl-a contribution to the separability of natural and synthetic emeralds by infrared spectroscopy. Journal of Gemology, 22, 215-223 https://doi.org/10.15506/JoG.1990.22.4.215
  18. Wood, D.L and Nassau, K (1967) Infrared spectra of foreign molecules in beryl. Journal of Chemical Physics, 47, 2220-2228 https://doi.org/10.1063/1.1703295
  19. Wood, D.L and Nassau, K (1968) The characterization of beryl and emerald by visible and infrared absorption spectroscopy. American Mineralogist, 53, May-June