Rossman, George R. and Fritsch, Emmanuel and Shigley, James E. (1991) Origin of color in cuprian elbaite from São José de Batalha, Paraíba, Brazil. American Mineralogist, 76 (9-10). pp. 1479-1484. ISSN 0003-004X. https://resolver.caltech.edu/CaltechAUTHORS:20140227-114154822
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Abstract
Gem-quality elbaite from Paraíba, Brazil, containing up to 1.4 wt% Cu has been characterized using optical spectroscopy and crystal chemistry. The optical absorption spectra of Cu^(2+) in these tourmalines consist of two bands with maxima in the 695- to 940-nm region that are more intense in the E ⊥ c direction. The vivid yellowish green to bluegreen colors of these elbaite samples arise primarily from Cu^(2+) and are modified to violetblue and violet hues by increasing absorptions from Mn^(3+).
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| Additional Information: | © 1991 Mineralogical Society of America. Manuscript received July 16, 1990. Manuscript accepted May 21, 1991. The authors wish to thank Gerhard Becker, Friedrich August Becker Edelsteinschleiferei, Idar-Oberstein, Germany, and Brian Cook, Nature's Geometry, Graton, California, for providing samples and information on the deposit shortly after its discovery. David Stanley Epstein, Precious Resources Ltda., Teόfilo Otoni, Brazil, provided useful information on the deposit, and Rock Currier from Monrovia, California, provided additional study material from this locality. Preliminary spectroscopic investigations were done by Mike Moon and Meredith Mercer, and the optical properties were measured by John I. Koivula and Christopher P. Smith, all from the Gemological Institute of America (GIA) or the GIA Gem Trade Laboratory, Santa Monica, California. X-ray crystal alignments were performed by William P. Schaeffer, and electron microprobe analyses were obtained by Paul Carpenter and John Armstrong, all with the California Institute of Technology, Pasadena, California. X-ray powder patterns were obtained by Waldo Winterburn, Center for Materials Research, Stanford University, Stanford, California. | ||||||
| Group: | UNSPECIFIED, Division of Geological and Planetary Sciences | ||||||
| Issue or Number: | 9-10 | ||||||
| Record Number: | CaltechAUTHORS:20140227-114154822 | ||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140227-114154822 | ||||||
| Official Citation: | George R. Rossman, Emmanuel Fritsch, and James E. Shigley Origin of color in cuprian elbaite from São José de Batalha, Paraiba, Brazil American Mineralogist, October 1991, v. 76, p. 1479-1484 | ||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
| ID Code: | 44037 | ||||||
| Collection: | CaltechAUTHORS | ||||||
| Deposited By: | Ruth Sustaita | ||||||
| Deposited On: | 27 Feb 2014 21:10 | ||||||
| Last Modified: | 03 Oct 2019 06:13 |
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