Infrared spectroscopy - FTIR - of the Pirenópolis emerald, Goiás State, Central Brazil
DOI:
https://doi.org/10.22456/1807-9806.20192Keywords:
esmeralda, espectroscopia no infravermelho, berilo, gema, Pirenópolis.Abstract
The infrared spectra of two natural samples of powdered emerald from Pirenópolis (Goiás State, Central Brazil) were measured at room temperature (~ 20ºC). Water molecules occur in two different configurations. Three absorption peaks (3656, 3592 and 1624 cm-1) record the vibrations of the type-II H2O. The peak absorption at 3691 cm-1 is assigned to type- I H2O vibrations. In addition, CO2 (2358 cm-1) and CH4 (2927-2925 cm-1) molecules were also detected in the FTIR spectra. These data can be applied to distinguish the Pirenópolis gem from the other Brazilian emeralds as well as its synthetic equivalents.
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Published
2000-06-30
How to Cite
PULZ, G. M., BARBOZA, ÉLZIO D. S., DE BRUM, T. M. M., FISCHER, A., JUCHEM, P. L., & BENVENUTTI, E. (2000). Infrared spectroscopy - FTIR - of the Pirenópolis emerald, Goiás State, Central Brazil. Pesquisas Em Geociências, 27(2), 79–85. https://doi.org/10.22456/1807-9806.20192
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