The properties of minerals used as gemstones could help or even reveal new aspects about the geological evolution of the region where a mineral was found. The objective of this study was the gemological characterization and acquisition of chemical data on staurolites from the city of Casa Nova (Bahia, Brazil). The gemological data are within the normal range for the staurolite mineral, except for the absence of pleochroism, above-average densities in two specimens, and a rare color (intense red) in a sample. The intrinsic part of these gems is in possible correlations involving their properties, such as: color, refractive index, birefringence, relative density, and the amounts of FeO in the samples. The geochemistry of these samples is unusual; FeO and MgO appear in considerably above-average quantities, and Al2O3 is up to 8% below average; the presence of CaO is also rare. Therefore, staurolites from Casa Nova (Bahia) have the potential to be used as gemstones, and their geochemistry combined with the gemology of these samples is a great indication for further studies.

Isaac Gomes de Oliveira

Isabelle Pinto Bezerra

Breno Ravielly dos Santos

Larissa De Sousa Silva

Antonio Leal Neto

Lucilene Dos Santos

Tereza Falcão de Oliveira Neri

Anuário do Instituto de Geociências

The Anuário do Instituto de Geociências (Anuário IGEO) is an official  publication of the Universidade Federal do Rio de Janeiro (UFRJ – CCMN)  with the objective to publish original scientific papers of broad interest in the  field of Geology, Paleontology, Geography and Meteorology.

The Anuario do Instituto de Geociências is an official publication of the Federal University of Rio de Janeiro (UFRJ – CCMN), aimed at publishing original scientific papers of broad interest in the fields of Geology, Paleontology, Geography, and Meteorology.

《Anuario do Instituto de Geociencias》是巴西里约热内卢联邦大学（UFRJ – CCMN）官方出版的期刊，旨在发表地质学、古生物学、地理学和气象学领域的原创科学论文，内容广泛且具有重要学术价值。

Gemology and Geochemistry of Staurolites from the Casa Nova Region, Brazil

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