The identification of amethyst origins by using FT-IR, UV-VIS spectrum analysis

ET-IR, UV-VIS 분광분석을 통한 자수정의 산지감별

  • Yoon Si-Nae (Department of Gemological Engineering, Dongshin University) ;
  • Yon Seog-Joo (Department of Gemological Engineering, Dongshin University)
  • Published : 2006.02.01

Abstract

Many amethysts of different origins such as South America, Aftrica, and Asia were compared. According to ICP-AES analysis, the colorizing elements were Fe, Cr, Cu, and Co. Amethysts from South America showed higher concentrations of the elements. UV- VIS analysis showed that both natural and synthetic amethysts were characterized by the higher absorption at 350 nm and 550 nm wavelength. The natural amethysts had lower permeability than that of the synthetic amethysts. According to FT-IR analysis, the synthetic amethysts were distinguished from the natural amethysts in that they had a typical absorption band of $3543cm^{-1}$. The amethyst from South America showed strong absorption bands of $3584cm^{-1}\;and\;3435cm^{-1}$, and African amethyst had absorption bands of $3299cm^{-1}\;and\;3196cm^{-1}$. $3381cm^{-1}$ absorption band was shown strongly for Asian origins.

남미, 아프리카, 아시아 대륙의 자수정을 대상으로 하였다 ICP-AES 분석에서 나타난 발색원소는 Fe, Cr, Cu, Co이며 대체적으로 남미 지역에서 발색원소의 함유량이 높게 나타났다. UV-VIS 분석결과 천연자수정과 합성자수정은 350nm 영역과 550nm 영역에서 흡수가 일어나는 특성을 나타냈고 투과율은 합성에 비해 천연이 낮게 나타났다. FT-IR분석결과 천연자수정과 합성자수정의 구분은 합성자수정의 특징인 $3543cm^{-1}$ 흡수밴드의 유무에 의해 알 수 있었다 남미 지역은 $3584cm^{-1},\;3435cm^{-1}$ 흡수밴드가 강하게 나타나며, 아프리카 지역은 $3299cm^{-1},\;3196cm^{-1}$ 흡수밴드가 나타났다. 아시아 지역은 $3381cm^{-1}$ 흡수밴드가 특징적으로 관찰되었다.

Keywords

References

  1. W.S. Kim, H.S. Shin and S.S. Lee, 'Characterization of inclusions in Amethysts from Eonyang, Korea', J. Mineralogical Soc. of Kor. 1(2) (1988) 83
  2. J. Shigley and W. Larson, 'Gem localities of the 1990s', G. and G. 36(4) (2000) 320
  3. K.S. Cho and D.H. Lee, 'Gem of the word' (goryeowon media, Seoul, 1994) p.162
  4. C.S. Han and K.H. Song, 'Electron spin resonance study of the hydrogen compensated $Fe^{3+}$ center in amethyst', J. Soonchunhyang Uni. 17(1) (1994) 143
  5. J.D. Lee, 'Gem and Gemology' (duyang, Seoul, 2003) p.327
  6. J. Koivula and K. Schmetzer, 'Synthetic gem materials and simulants in the 1990s', G. and G. 36(4) (2000) 369
  7. K. Nassau, 'Synthetic gem materials in the 1980s', G. and G. 26(1) (1990) 56
  8. J.G Kim, 'The mystery of Korea amethyst' (Uo Seok, Seoul, 2003) p.88
  9. W.S. Kim, 'Gemology' (Woosung, Seoul, 1997) p.104
  10. Y.S. Chung, S.O. Kang, Y.I. Lee and Y.M. Lee, 'Instrumental analysis' (Info-Tech Corea Publishing Co. Seoul, 2004) p.129
  11. V. Balitsky and O. Balitskaya, 'The 3543 $cm^{-1}$ infrared absorption band in natural and synthetic amethyst and its value in identification', G. and G. 40(2) (2004) 146