@InProceedings{OliveiraBarrCarrCorr:2017:EsReAp,
               author = "Oliveira, Paula Jussara Azevedo de and Barreto, Sandra de Brito 
                         and Carrino, Thais Andressa and Correia, Aldine Maria de Lima",
                title = "Espectroscopia de reflet{\^a}ncia aplicada {\`a} 
                         caracteriza{\c{c}}{\~a}o de turmalinas gemol{\'o}gicas 
                         provenientes da Prov{\'{\i}}ncia Pegmat{\'{\i}}tica da 
                         Borborema, Nordeste do Brasil",
            booktitle = "Anais...",
                 year = "2017",
               editor = "Gherardi, Douglas Francisco Marcolino and Arag{\~a}o, Luiz 
                         Eduardo Oliveira e Cruz de",
                pages = "1754--1761",
         organization = "Simp{\'o}sio Brasileiro de Sensoriamento Remoto, 18. (SBSR)",
            publisher = "Instituto Nacional de Pesquisas Espaciais (INPE)",
              address = "S{\~a}o Jos{\'e} dos Campos",
             abstract = "This article aims to evaluate the effectiveness of the reflectance 
                         spectroscopy technique applied to Gemology, focusing on the 
                         characterization of tourmalines related to pegmatites located in 
                         the Borborema Pegmatite Province, Northeast Brazil. Elbaite 
                         tourmalines (n=9) were analyzed and classified in four groups 
                         based on their colours: (i) green and blue, (ii) turquoise 
                         (Para{\'{\i}}ba); (iii) red and purple; (iv) colourless. 
                         Reflectance spectroscopy data were obtained using FieldSpec? (ASD) 
                         spectroradiometer, as well as, geochemical data, by electron 
                         microprobe analysis. Reflectance spectra were investigated 
                         visually, and absorption features were interpreted, and related to 
                         chromophore elements (Fe, Cu, Mn). The application of the 
                         continuum removal technique became possible the correlation 
                         between depth of absorption features in the VNIR range, and 
                         contents of chromophore elements. Specifically, samples marked by 
                         high CuO and FeO contents showed more intense depth of absorption 
                         features centered at 920 and 730 nm, respectively. Additionally, 
                         diagnostic absorption features of elbaites were identified in the 
                         SWIR range, and related to molecular vibrational processes (e.g., 
                         OH, H2O, metal-OH). The results of this study show the 
                         applicability of the reflectance spectroscopy technique for 
                         characterizing tourmalines quickly, resulting in an initial 
                         spectral library. This spectral library will facilitate the 
                         characterization of other gemological tourmaline in the study 
                         region, including the possibility of estimating contents of 
                         determined elements.",
  conference-location = "Santos",
      conference-year = "28-31 maio 2017",
                 isbn = "978-85-17-00088-1",
                label = "59784",
             language = "pt",
         organisation = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                  ibi = "8JMKD3MGP6W34M/3PSLP9K",
                  url = "http://urlib.net/ibi/8JMKD3MGP6W34M/3PSLP9K",
           targetfile = "59784.pdf",
                 type = "Geologia",
        urlaccessdate = "27 abr. 2024"
}