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

Yoon Si-Nae (Department of Gemological Engineering, Dongshin University)
Yon Seog-Joo (Department of Gemological Engineering, Dongshin University)
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.
Keywords
Amethyst; ICP-AES; UV-VIS; FT-IR; Synthetic;
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