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