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Almeidaite, Pb(Mn,Y)Zn2(Ti,Fe3+)18O36(O,OH)2, a new crichtonite-group mineral, from Novo Horizonte, Bahia, Brazil

Published online by Cambridge University Press:  02 January 2018

Luiz A. D. Menezes Filho
Affiliation:
Universidade Federal de Minas Gerais (UFMG), Instituto de Geociências, Avenida Antônio Carlos, 6627, 31270-902, Belo Horizonte, Minas Gerais, Brazil
Nikita V. Chukanov
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia
Ramiza K. Rastsvetaeva
Affiliation:
Institute of Crystallography, Russian Academy of Sciences, Leninskiy Prospekt 59, Moscow, 117333 Russia
Sergey M. Aksenov
Affiliation:
Institute of Crystallography, Russian Academy of Sciences, Leninskiy Prospekt 59, Moscow, 117333 Russia
Igor V. Pekov
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991 Russia
Mário L. S. C. Chaves
Affiliation:
Universidade Federal de Minas Gerais (UFMG), Instituto de Geociências, Avenida Antônio Carlos, 6627, 31270-902, Belo Horizonte, Minas Gerais, Brazil
R. Peter Richards
Affiliation:
Affiliate Scholar, Department of Geology, Oberlin College, Oberlin, Ohio 44074
Daniel Atencio
Affiliation:
Universidade de São Paulo, Instituto de Geociências, Rua do Lago, 562, 05508-080, São Paulo, SP, Brazil
Paulo R. G. Brandão
Affiliation:
Universidade Federal de Minas Gerais (UFMG), Escola de Engenharia, Departamento de Engenharia de Minas, Avenida Antônio Carlos, 6627, 31270-902, Belo Horizonte, Minas Gerais, Brazil
Ricardo Scholz
Affiliation:
Universidade Federal de Ouro Preto (UFOP), Escola de Minas, Departamento de Geologia, Campus Morro do Cruzeiro, 35400-000, Ouro Preto, Minas Gerais, Brazil
Klaus Krambrock
Affiliation:
Universidade Federal de Minas Gerais (UFMG), Instituto de Ciências Exatas, Departamento de Física, Avenida Antônio Carlos, 6627, 31270-901, Belo Horizonte, Minas Gerais, Brazil
Roberto L. Moreira
Affiliation:
Universidade Federal de Minas Gerais (UFMG), Instituto de Ciências Exatas, Departamento de Física, Avenida Antônio Carlos, 6627, 31270-901, Belo Horizonte, Minas Gerais, Brazil
Frederico S. Guimarães
Affiliation:
Universidade Federal de Minas Gerais (UFMG), Instituto de Ciências Exatas, Departamento de Física, Avenida Antônio Carlos, 6627, 31270-901, Belo Horizonte, Minas Gerais, Brazil
Antônio W. Romano
Affiliation:
Universidade Federal de Minas Gerais (UFMG), Instituto de Geociências, Avenida Antônio Carlos, 6627, 31270-902, Belo Horizonte, Minas Gerais, Brazil
Aba C. Persiano
Affiliation:
Universidade Federal de Minas Gerais (UFMG), Instituto de Ciências Exatas, Departamento de Física, Avenida Antônio Carlos, 6627, 31270-901, Belo Horizonte, Minas Gerais, Brazil
Luiz C. A. de Oliveira
Affiliation:
Universidade Federal de Minas Gerais (UFMG), Instituto de Ciências Exatas, Departamento de Química, Avenida Antônio Carlos, 6627, 31270-901, Belo Horizonte, Minas Gerais, Brazil
José D. Ardisson
Affiliation:
CNEN/CDTN/SENAN - Laborató rio Aplicada de Física, Av. Antônio Carlos 6627, 31270-901 Belo Horizonte, Minas Gerais, Brazil
Corresponding
E-mail address:

Abstract

Almeidaite (IMA 2013-020), ideally Pb(Mn, Y)Zn2(Ti,Fe3+)18O36(O, OH)2, from Novo Horizonte, Bahia, Brazil, occurs in association with quartz, rutile, anatase, hematite, kaolinite, muscovite, xenotime-(Y) and bastnaesite-(La). Almeidaite forms isolated, black, opaque, sub-metallic, platy crystals flattened on [0001], measuring up to 30 mm 6 30 mm 6 6 mm in size, dominated by the basal pinacoid {0001}, which is bounded by various, mostly steep, rhombohedra and the hexagonal prism {1120}. Most of the crystals are multiply twinned, with non-planar contact surfaces that are approximately parallel to the c axis. The streak is brown. Reflectance values are [(R o, R e) λ (nm)]: (12.78, 15.39) 470; (12.86, 15.43) 546; (12.91, 15.55) 589; (13.04, 15.75) 650. The empirical formula is (Pb0.59Sr0.12Ca0.04La0.03)Σ0.78(Mn0.54Y0.46)Σ1.00Zn1.43(Ti13.02Fe4.98 3+)Σ18.00(Fe0.32 3+Mn0.15)Σ0.47[O37.18(OH)0.82]Σ38.00. It is trigonal, space group R3, with the unit-cell parameters a = 10.4359(2), c = 21.0471(4) Å, V = 1985.10(7) Å3 and Z = 3. The crystal structure was solved (R 1 = 0.039) using 2110 unique reflections with I > 3σ(I). Almeidaite is a member of the crichtonite group with Pb dominant in the A site (with 12-fold coordination) and Zn dominant in the T site (with 4-fold coordination). It is a Zn analogue of senaite and a Pb analogue of landauite. The mineral is named after Professor Fernando Flávio Marques de Almeida (1916–2013).

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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References

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Almeidaite, Pb(Mn,Y)Zn2(Ti,Fe3+)18O36(O,OH)2, a new crichtonite-group mineral, from Novo Horizonte, Bahia, Brazil
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