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Brumadoite, a new copper tellurate hydrate, from Brumado, Bahia, Brazil

  • D. Atencio (a1), A. C. Roberts (a2), P. A. Matioli (a3), J. A. R. Stirling (a2), K. E. Venance (a2), W. Doherty (a2), C. J. Stanley (a4), R. Rowe (a5), G. J. C. Carpenter (a6) and J. M. V. Coutinho (a1)...

Abstract

Brumadoite, ideally Cu3Te6+O4(OH)4-5H2O, is a new mineral from Pedra Preta mine, Serra das Eguas. Brumado, Bahia, Brazil. It occurs as microcrystalline aggregates both on and, rarely, pseudomorphous after coarse-grained magnesite, associated with mottramite and quartz. Crystals are platy, subhedral. 1—2 μm in size. Brumadoite is blue (near RHS 114B), has a pale blue streak and a vitreous lustre. It is transparent to translucent and does not fluoresce. The empirical formula is (Cu2.90Pb0.04Ca0.01)Σ2.95 (Te0.93 6+Si0.05)Σ0.98O3.92(OH)3.84.5.24H2O. Infrared spectra clearly show both (OH) and H2O. Microchemical spot tests using a KI solution show that brumadoite has tellurium in the 6+ state. The mineral is monoclinic, P2/m or P21. Unit-cell parameters refined from X-ray powder data are a 8.629(2) Å, b 5.805(2) Å, c 7.654(2) Å,β 0 103.17(2)°, F 373.3(2) Å3, Z= 2. The eight strongest X-ray powder-diffraction lines [d in Å,(I),(hkl)] are: 8.432,(100),(100); 3.162,(66),(2̄02); 2.385,(27),(220); 2.291,(12),(l̄22); 1.916,(11),(312); 1.666,(14),(4̄22,114); 1.452,(10),(323,040); 1.450,(10),(422,403). The name is for the type locality, Brumado, Bahia, Brazil. The new mineral species has been approved by the CNMNC (IMA 2008-028).

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*E-mail: datencio@usp.br

References

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Barbosa, C.P., Falster, A.U., Simmons, W.B., Webber, K.L., Nizamoff, J. and Games, R.V. (2000) Minerals of the Brumado magnesite deposits, Serra das Eguas, Bahia, Brazil. Rocks and Minerals, 75, 3239.
Bodenlos, AJ. (1954) Magnesite deposits in the Serra das Eguas, Brumado, Bahia, Brazil. U.S. Geological Survey Bulletin 975-C, 170 pp.
Cassedanne, J.P. and Cassedanne, J.O. (1978) Famous mineral localities: The Brumado district, Bahia , Brazil. Mineralogical Record, 9, 196205.
Grice, J.D., Groat, L.A. and Roberts, A.C. (1996) Jensenite, a cupric tellurate framework structure with two coordinations of copper. The Canadian Mineralogist, 34, 5559.
Roberts, A.C, Ercit, T.S., Criddle, A.J., Jones, G.C., Williams, R.S., Cureton, F.F. and Jensen, M.C. (1994) Mcalpineite, Cu3TeO6.H2O, a new mineral from the McAlpine Mine, Tuolumne County, California, and from the Centennial Eureka Mine, Juab County, Utah. Mineralogical Magazine, 58, 417424.
Roberts, A.C, Grice, J.D., Groat, L.A., Criddle, A.J., Gault, R.A., Erd, R.C. and Moffatt, E.A. (1996) Jensenite, Cu3Te6+O,5 2H2O, a new mineral species from the Centennial Eureka Mine, Tintic District, Juab County, Utah. The Canadian Mineralogist, 34, 4954.
Strunz, H. and Nickel, E.H. (2001) Strunz Mineralogical Tables, 9th edition. E. Schweizerbart'sche Verlagsbuchhandlung (Nagele und Obermiller), Stuttgart, Germany.
Williams, S.A. (1975) Xocomecatlite, Cu3TeO4(OH)4, and Tlalocite, CuioZn6(Te03)(Te04)2C1(OH)25-27H2O, Two New Minerals from Moctezuma, Sonora, Mexico. Mineralogical Magazine, 40, 221226.

Keywords

Brumadoite, a new copper tellurate hydrate, from Brumado, Bahia, Brazil

  • D. Atencio (a1), A. C. Roberts (a2), P. A. Matioli (a3), J. A. R. Stirling (a2), K. E. Venance (a2), W. Doherty (a2), C. J. Stanley (a4), R. Rowe (a5), G. J. C. Carpenter (a6) and J. M. V. Coutinho (a1)...

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