Gemology of Emeralds from Tauá, Brazil
In Brazilian territory many occurrences do not have their gemological and optical properties documented or made public. This research aimed to analyze the mineralogical and gemological aspects of emeralds from the city of Tauá (Brazil), utilizing gemological instruments such as a refractometer, dichroscope, spectroscope, polariscope, hydrostatic balance, ultraviolet lamp, and gemological microscope. The examined emeralds exhibit typical features found in emeralds worldwide, except for an above-average birefringence, similar to certain beryls from the state of Ceará. This highlights the significance of gemological characterization not only at the regional levels but also on a localized scale. Additionally, studying occurrences in varied geological settings is essential, as the formation environment influences mineral properties.
Authors
- Laryssa de Sousa Carneiro (ORCID: https://orcid.org/0000-0003-3448-3322)
- Lee A. Groat (ORCID: https://orcid.org/0000-0003-0108-0842)
- Lucilene dos Santos (ORCID: https://orcid.org/0000-0002-8304-6869)
- C. W. A. Paschoal (ORCID: https://orcid.org/0000-0001-9055-387X)
- Isaac Gomes de Oliveira (ORCID: https://orcid.org/0000-0002-3874-4238)
- Gabriel Santos (ORCID: https://orcid.org/0009-0008-5089-8900)
- Conceição Regina Fernandes Alves (ORCID: https://orcid.org/0000-0001-5769-4910)
- Tereza Falcão de Oliveira Neri
- Alina De Oliveira Cunha
Institutions
- Universidade Tecnológica Federal do Paraná (BR)
- University of British Columbia (CA)
- Universidade Estadual de Campinas (UNICAMP) (BR)
- Universidade Federal do Ceará (BR)
- Universidade Federal do Paraná (BR)
Publication Details
- Journal
- Anuário do Instituto de Geociências
- Published
- 2025-10-07
- DOI
- https://doi.org/10.11137/1982-3908_2025_48_67822
- Primary Topic
- Mineralogy and Gemology Studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico