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Raman Spectroscopic Study of the Molybdate Mineral Szenicsite and Comparison with Other Paragenetically Related Molybdate Minerals

2007; Taylor & Francis; Volume: 40; Issue: 4 Linguagem: Inglês

10.1080/00387010701301220

1532-2289

Ray L. Frost, J. Bouzaid, Ian S. Butler,

Radioactive element chemistry and processing

Abstract Abstract The molybdate‐bearing mineral szenicsite, Cu3(MoO4)(OH)4, has been studied by Raman and infrared spectroscopy. A comparison of the Raman spectra is made with those of the closely related molybdate‐bearing minerals, wulfenite, powellite, lindgrenite, and iriginite, which show common paragenesis. The Raman spectrum of szenicsite displays an intense, sharp band at 898 cm−1, attributed to the ν1 symmetric stretching vibration of the MoO4 units. The position of this particular band may be compared with the values of 871 cm−1 for wulfenite and scheelite and 879 cm−1 for powellite. Two Raman bands are observed at 827 and 801 cm−1 for szenicsite, which are assigned to the ν3(E g ) vibrational mode of the molybdate anion. The two MO4 ν2 modes are observed at 349 (B g ) and 308 cm−1 (A g ). The Raman band at 408 cm−1 for szenicsite is assigned to the ν4(E g ) band. The Raman spectra are assigned according to a factor group analysis and are related to the structure of the minerals. The various minerals mentioned have characteristically different Raman spectra. Keywords: IriginitelindgrenitemolybdatepowelliteRaman spectroscopyszenicsitewulfenite Acknowledgments The financial and infrastructure support of the Queensland University of Technology Inorganic Materials Research Program of the School of Physical and Chemical Sciences is gratefully acknowledged. The Australian Research Council (ARC) is thanked for funding the Raman spectrometers. Ms. Sara Palmer is thanked for collecting some of the Raman spectra.