Distinguishing natural from synthetic amethyst: the presence and shape of the 3595 cm−1 peak |
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| Authors: | S Karampelas E Fritsch T Zorba K M Paraskevopoulos S Sklavounos |
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| Institution: | (1) Laboratory of Mineralogy – Petrology – Economic Geology, Department of Geology, Aristotle University of Thessaloniki, Thessaloniki, Greece;(2) Laboratoire de Physique des Matériaux et Nanostructures – Equipe Matériaux Absorbants et Photoluminescents, Institut des Matériaux Jean Rouxel (IMN), Nantes, France;(3) Solid State Physics Section, Physics Department, Aristotle University of Thessaloniki, Thessaloniki, Greece |
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| Abstract: | Summary The infrared absorption spectrum of amethyst in the region of stretching vibrations of X–OH groups reveals several bands that
have been used for the separation of natural from synthetic amethyst. The intensity and shape of these bands have been measured
as a function of crystallographic orientation. Using a resolution of 0.5 cm−1 the 3595 cm−1 band is present in all infrared spectra of natural amethyst and in some rare synthetic ones. If present in synthetic amethyst,
its full width at half maximum (FWHM) is about 7 cm−1 whereas it is about 3 cm−1 in all natural samples. This new criterion, unlike the previous ones, seems appropriate to separate natural from synthetic
amethyst in all cases. |
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