FAAS, FT-IR and XRD Identification of Natural and Heat Treated Opals Located in Wadla Woreda, North Wello, Ethiopia

Main Article Content

Adere Tarekegne Habte
Shiferaw Dessie Mekonnen
Adugna Nigatu Alene
Gietu Yirga Abate

Abstract

Opals are naturally occurring hydrous silica materials (SiO2*nH2O), and have been largely used in jewelry and as decorative elements in artworks due to their optical properties. In this study, we present some gemological properties, a combined spectroscopic (FAAS, FTIR) and X-ray powder diffraction (XRD) identification of natural and heat treated opals obtained from the main deposits in North Wollo, Ethiopia. The gemological measurements, FTIR and XRD spectra for natural and heat treated samples are nearly identical, FAAS shows clear differences on their color this may be due to the concentration differences of metals. Both of these opals showed spectra and diffraction patterns typical of Opal-CT, with clearly defined patterns and main peaks in the 2θ range of cristobalite and tridymite, called microcrystalline opals.

Keywords:
Opal, XRD, FAAS, FT-IR, Opal-CT, microcrystalline.

Article Details

How to Cite
Habte, A. T., Mekonnen, S. D., Alene, A. N., & Abate, G. Y. (2020). FAAS, FT-IR and XRD Identification of Natural and Heat Treated Opals Located in Wadla Woreda, North Wello, Ethiopia. Asian Journal of Applied Chemistry Research, 7(1), 1-8. https://doi.org/10.9734/ajacr/2020/v7i130171
Section
Original Research Article

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