@article{araújo neto_barreto_carrino_müller_santos_2019,  title={Mineralogical and gemological characterization of emerald crystals from Paraná deposit, NE Brazil: a study of mineral chemistry, absorption and reflectance spectroscopy and thermal analysis},  volume={49},  ISSN={2317-4889},  url={https://doi.org/10.1590/2317-4889201920190014},  DOI={10.1590/2317-4889201920190014},  number={3},  journal={Brazilian Journal of Geology},  publisher={Sociedade Brasileira de Geologia},  author={Araújo Neto, José Ferreira de and Barreto, Sandra de Brito and Carrino, Thais Andressa and Müller, Axel and Santos, Lauro Cézar Montefalco de Lira},  year={2019},  pages={e20190014} }