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Daliranite, PbHgAs2S6, a new sulphosalt from the Zarshouran Au-As deposit, Takab region, Iran

Published online by Cambridge University Press:  05 July 2018

W. H. Paar ,
A. Pring ,
Y. Moëlo ,
C. J. Stanley ,
H. Putz ,
D. Topa ,
A. C. Roberts  and
R. S. W. Braithwaite
W. H. Paar*
Affiliation:
Department of Materials Engineering and Physics (Division of Mineralogy), University of Salzburg, Hellbrunnerstrasse 34, A-5020 Salzburg, Austria
A. Pring
Affiliation:
Department of Mineralogy, South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia The School of Earth and Environmental Sciences, University of Adelaide, Adelaide, South Australia 5005, Australia
Y. Moëlo
Affiliation:
Institut des Materiaux J. Rouxel (IMN), Université de Nantes, CNRS, 2 rue de la Houssiniere, F-44322 Nantes Cedex 3, France
C. J. Stanley
Affiliation:
The Natural History Museum, Cromwell Road, London SW7 5BD, England, UK
H. Putz
Affiliation:
Department of Materials Engineering and Physics (Division of Mineralogy), University of Salzburg, Hellbrunnerstrasse 34, A-5020 Salzburg, Austria
D. Topa
Affiliation:
Department of Materials Engineering and Physics (Division of Mineralogy), University of Salzburg, Hellbrunnerstrasse 34, A-5020 Salzburg, Austria
A. C. Roberts
Affiliation:
Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A OE8, Canada
R. S. W. Braithwaite
Affiliation:
School of Chemistry, University of Manchester, Manchester M13 9PL, UK
*
* E-mail: [email protected]
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Abstract

Daliranite, ideally PbHgAs2S6, a new sulphosalt from the Zarshouran Au-As deposit, Takab region, Iran, occurs as a rare sulphosalt species at the Carlin-type Zarshouran Au-As deposit North of the town of Takab in the Province of West Azarbaijan, Iran. The new species is associated with orpiment, rarely with galkhaite, hutchinsonite and cinnabar. The strongly silicified matrix of the specimens has veinlets of sphalerite, with rare inclusions of galena and various (Cu)-Pb-As(Sb) sulphosalts. Daliranite occurs as matted nests of acicular and flexible fibres up to 200 μm in length and a width less than a few μm. The colour is orange-red with a pale orange-red streak and the lustre is adamantine. The mineral is transparent and does not fluoresce. The Mohs hardness is <2. Electron microprobe analyses give the empirical formula Pb0.95Tl0.01Hg1.04As2.10S5.91, ideally PbHgAs2S6, a new sulphosalt from the Zarshouran Au-As deposit, Takab region, Iran; the calculated density is 5.93 g cm–3. Unit-cell parameters were determined by an electron-diffraction study and refined from X-ray powder data. Daliranite is monoclinic primitive with a = 19.113(5) Å, b = 4.233(2) Å, c = 22.958(8) Å, β = 114.78(5)°, V = 1686.4 Å3 and Z = 8, a:b:c = 4.515:1:5.424, space group P2, Pm or P2/m. The strongest X-ray powder-diffraction lines [d in Å, (I), (hkl)] are: 8.676, (80), (200); 4.654, (50), (401); 3.870, (40), (211); 3.394, (50), (113); 3.148, (40b), (602); 2.892, (50), (600); 2.724, (100), (703); 2.185, (50), (319). The formula shows a sulphur excess which may correspond to S—S bonding (persulphide). The new sulphosalt is a late phase in the crystallization sequence, and was formed after orpiment, contemporaneously with quartz II, at a temperature between 157 and 193°C. The name honours Dr Farahnaz Daliran (University of Karlsruhe, Germany) in recognition of her outstanding contributions to research on ore deposits, especially Au, Zn and Fe, in Iran.

Keywords

daliranitesulphosaltleadmercuryarsenicZarshouran depositWest Azarbaijan provinceIran.
Type
Research Article
Information
Mineralogical Magazine , Volume 73 , Issue 5 , October 2009 , pp. 871 - 881
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2009

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