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Coiraite, (Pb,Sn2+)12.5As3Fe2+Sn4+5 S28: a franckeite-type new mineral species from Jujuy Province, NW Argentina

Published online by Cambridge University Press:  05 July 2018

W. H. Paar ,
Y. Moëlo ,
N. N. Mozgova ,
N. I. Organova ,
C. J. Stanley ,
A. C. Roberts ,
F. J. Culetto ,
H. S. Effenberger ,
D. Topa  and
H. Putz
...Show all authors
W. H. Paar*
Affiliation:
Department of Materials Engineering and Physics (Division of Mineralogy), University of Salzburg, Hellbrunnerstr. 34, A-5020 Salzburg, Austria
Y. Moëlo
Affiliation:
Institut des Matériaux J.Rouxel (IMN), Université de Nantes, CNRS, 2, rue de la Houssinière, F-44322 Nantes Cedex 3, France
N. N. Mozgova
Affiliation:
IGEM RAS, Staromonetny 35, Moscow 119017, Russia
N. I. Organova
Affiliation:
IGEM RAS, Staromonetny 35, Moscow 119017, Russia
C. J. Stanley
Affiliation:
The Natural History Museum, Cromwell Road, London SW7 5BD, England UK
A. C. Roberts
Affiliation:
Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A OE8, Canada
F. J. Culetto
Affiliation:
KELAG-Kärntner Elektrizitäts-Aktiengesellschaft, Arnulfplatz 2, A-9020 Klagenfurt, Austria
H. S. Effenberger
Affiliation:
Institut für Mineralogie und Kristallographie, Universität Wien, Althanstrasse 14, A-1090 Vienna, Austria
D. Topa
Affiliation:
Department of Materials Engineering and Physics (Division of Mineralogy), University of Salzburg, Hellbrunnerstr. 34, A-5020 Salzburg, Austria
H. Putz
Affiliation:
Department of Materials Engineering and Physics (Division of Mineralogy), University of Salzburg, Hellbrunnerstr. 34, A-5020 Salzburg, Austria
R. J. Sureda
Affiliation:
Cátedra de Mineralogía, Facultad de Ciencias Naturales, Universidad Nacional de Salta, 4400 Salta, Argentina
M. K. de Brodtkorb
Affiliation:
Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Paso 258-9°, 1640 Martinez, Argentina
*
*E-mail: werner.paar@sbg.ac.at
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Abstract

Coiraite, ideally (Pb,Sn2+)12.5As3Fe2+Sn4+S28, occurs as an economically important tin ore in the large Ag-Sn-Zn polymetallic Pirquitas deposit, Jujuy Province, NW-Argentina. The new mineral species is the As derivative of franckeite and belongs to the cylindrite group of complex Pb sulphosalts with incommensurate composite-layered structures. It is a primary mineral, frequently found in colloform textures, and formed from hydrothermal solutions at low temperature. Associated minerals are franckeite, cylindrite, pyrite-marcasite, as well as minor amounts of hocartite, Ag-rich rhodostannite. arsenopyrite and galena. Laminae of coiraite consist of extremely thin bent platy crystals up to 50 urn long. Electron microprobe analysis (n = 31) gave an empirical formula Pb11.21As2.99Ag0.13Fe1.10Sn6.13S28.0 close to the ideal formula (Pb11.3Sn2+1.2)Σ=12.5As3Fe2+Sn4+S28. Coiraite has two monoclinic sub-cells, Q (pseudotetragonal) and H (pseudohexagonal). Q: a 5.84(1) Å, b 5.86(1) Å, c 17.32(1) Å, β 94.14(1)°, F 590.05(3) Å3, Z = 4, a:b:c = 0.997:1:2.955; H (orthogonal setting): a 6.28(1) Å, b 3.66(1) Å, c 17.33(1) Å, β 91.46(1)°, V398.01(6) Å3, Z = 2, a∶b∶c = 1.716∶1∶4.735. The strongest Debye-Scherrer camera X-ray powder-diffraction lines [d in Å, (I), (hkl)] are: 5.78, (20), (Q and H 003); 4.34, (40), (Q 004); 3.46, (30), (Q and H 005); 3.339, (20), (Q 104); 2.876, (100), (Q and H 006); 2.068, (60), (Q 220).

Keywords

coiraiteAs-derivative of franckeitetinarseniccylindrite groupsulphosalt
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 5 , October 2008 , pp. 1083 - 1101
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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