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

Published online by Cambridge University Press:  05 July 2018

D. Atencio ,
A. C. Roberts ,
P. A. Matioli ,
J. A. R. Stirling ,
K. E. Venance ,
W. Doherty ,
C. J. Stanley ,
R. Rowe ,
G. J. C. Carpenter  and
J. M. V. Coutinho
D. Atencio*
Affiliation:
Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, 05508-080, São Paulo, SP, Brazil
A. C. Roberts
Affiliation:
Geological Survey of Canada, 601 Booth Street, Ottawa Ontario, K1A 0E8, Canada
P. A. Matioli
Affiliation:
Museu de Ciências Naturais José Bonifácio de Andrada e Silva (Jobas) — Largo Marquês de Monte Alegre, s/no., Valongo, Centro Histórico, 11010-260, Santos, SP, Brazil
J. A. R. Stirling
Affiliation:
Geological Survey of Canada, 601 Booth Street, Ottawa Ontario, K1A 0E8, Canada
K. E. Venance
Affiliation:
Geological Survey of Canada, 601 Booth Street, Ottawa Ontario, K1A 0E8, Canada
W. Doherty
Affiliation:
Geological Survey of Canada, 601 Booth Street, Ottawa Ontario, K1A 0E8, Canada
C. J. Stanley
Affiliation:
Department of Mineralogy, Natural History Museum, London SW7 5BD, UK
R. Rowe
Affiliation:
Canadian Museum of Nature, PO Box 3443, Station D, Ottawa, Ontario, K1P 6P4, Canada
G. J. C. Carpenter
Affiliation:
Materials Technology Laboratories, Natural Resources Canada, 568 Booth Street, Ottawa Ontario, K1A 0G1, Canada
J. M. V. Coutinho
Affiliation:
Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, 05508-080, São Paulo, SP, Brazil
*
*E-mail: datencio@usp.br
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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 (Te0.936+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).

Keywords

brumadoitecopper tellurate hydratenew mineralBrumadoBrazil
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 6 , December 2008 , pp. 1201 - 1205
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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