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Parisite-(La), ideally CaLa2(CO3)3F2, a new mineral from Novo Horizonte, Bahia, Brazil

Published online by Cambridge University Press:  28 February 2018

Luiz A. D. Menezes Filho
Affiliation:
Universidade Federal de Minas Gerais (UFMG), Instituto de Geociências, Departamento de Geologia, Avenida Antônio Carlos, 6627, 31270-901, Belo Horizonte, MG, Brazil
Mario L. S. C. Chaves
Affiliation:
Universidade Federal de Minas Gerais (UFMG), Instituto de Geociências, Departamento de Geologia, Avenida Antônio Carlos, 6627, 31270-901, Belo Horizonte, MG, Brazil
Nikita V. Chukanov
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432Russia
Daniel Atencio*
Affiliation:
Universidade de São Paulo, Instituto de Geociências, Rua do Lago 562, 05508-080, São Paulo, Brazil
Ricardo Scholz
Affiliation:
Universidade Federal de Ouro Preto (UFOP), Escola de Minas, Departamento de Geologia, Campus Morro do Cruzeiro, 35400-000, Ouro Preto, MG, Brazil
Igor Pekov
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991Russia
Geraldo Magela da Costa
Affiliation:
Universidade Federal de Ouro Preto (UFOP), Instituto de Ciências Exatas e Biológicas, Departamento de Química, Campus Morro do Cruzeiro, 35400-000, Ouro Preto, MG, Brazil
Shaunna M. Morrison
Affiliation:
Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA.
Marcelo B. Andrade
Affiliation:
University of São Paulo, São Carlos Institute of Physics, PO Box 369, 13560-970, São Carlos, SP, Brazil
Erico T. F. Freitas
Affiliation:
Universidade Federal de Minas Gerais (UFMG), Centro de Microscopia, Avenida Antônio Carlos, 6627, 31270-901, Belo Horizonte, MG, Brazil
Robert T. Downs
Affiliation:
Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA.
Dmitriy I. Belakovskiy
Affiliation:
Fersman Mineralogical Museum of Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow, 119071Russia
*

Abstract

Parisite-(La) (IMA2016-031), ideally CaLa2(CO3)3F2, occurs in a hydrothermal vein crosscutting a metarhyolite of the Rio dos Remédios Group, at the Mula mine, Tapera village, Novo Horizonte county, Bahia, Brazil, associated with hematite, rutile, almeidaite, fluocerite-(Ce), brockite, monazite-(La), rhabdophane-(La) and bastnäsite-(La). Parisite-(La) occurs as residual nuclei (up to 5 mm) in steep doubly-terminated pseudo-hexagonal pyramidal crystals (up to 8.2 cm). Parisite-(La) is transparent, yellow-green to white, with a white streak and displays a vitreous (when yellow-green) to dull (when white) lustre. Cleavage is distinct on pseudo-{001}; fracture is laminated, conchoidal, or uneven. The Mohs hardness is 4 to 5, and it is brittle. Calculated density is 4.273 g cm−3. Parisite-(La) is pseudo-uniaxial (+), ω = 1.670(2) and ε = 1.782(5) (589 nm). The empirical formula normalized on the basis of 11 (O + F) atoms per formula unit (apfu) is Ca0.98(La0.83Nd0.51Ce0.37Pr0.16Sm0.04Y0.03)Σ1.94C3.03O8.91F2.09. The IR spectrum confirms the absence of OH groups. Single-crystal X-ray studies gave the following results: monoclinic (pseudo-trigonal), space group: C2, Cm, or C2/m, a = 12.356(1) Å, b = 7.1368(7) Å, c = 28.299(3) Å, β = 98.342(4)°, V = 2469.1(4) Å3 and Z = 12. Parisite-(La) is the La-dominant analogue of parisite-(Ce).

Type
Article
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Deceased July 2014

Associate Editor: Stuart Mills

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