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Suseinargiuite, (Na (sub 0.5) Bi (sub 0.5) )MoO (sub 4) , the Na-Bi analogue of wulfenite, from Su Seinargiu, Sardinia, Italy

Paolo Orlandi, Cristian Biagioni, Yves Moelo, Jessica Langlade and Eric Faulques
Suseinargiuite, (Na (sub 0.5) Bi (sub 0.5) )MoO (sub 4) , the Na-Bi analogue of wulfenite, from Su Seinargiu, Sardinia, Italy
European Journal of Mineralogy (July 2015) 27 (5): 695-699

Abstract

The new mineral species suseinargiuite, (Na (sub 0.5) Bi (sub 0.5) )MoO (sub 4) , has been discovered in the Mo-Bi occurrence of Su Seinargiu, Sarroch, Cagliari, Sardinia, Italy. It occurs as hemispherical aggregates of very small acicular crystals, up to some micrometres in length. It is colourless, with a pearly to adamantine lustre. In the studied specimens, suseinargiuite is associated with wulfenite. Micro-Raman spectra were collected in the region between 100 and 2000 cm (super -1) . The following bands have been observed (in cm (super -1) ): 131, 188, 319, approximately 376, approximately 772, and 876. Electron microprobe data collected on a chemically zoned grain gave (outer and inner zone, respectively - in wt%): MoO (sub 3) 49.03, Bi (sub 2) O (sub 3) 42.97, PbO 2.89, Na (sub 2) O 3.69, total 98.58, and MoO (sub 3) 45.59, Bi (sub 2) O (sub 3) 34.47, PbO 12.04, Na (sub 2) O 3.03, total 95.13. On the basis of 4 O atoms per formula unit, the relevant chemical formulae are (Na (sub 0.35) Bi (sub 0.54) Pb (sub 0.04) ) (sub Sigma =0.93) Mo (sub 0.99) O (sub 4) and (Na (sub 0.31) Bi (sub 0.46) Pb (sub 0.17) ) (sub Sigma =0.94) Mo (sub 0.99) O (sub 4) , respectively. Main diffraction lines are [d in Aa (relative intensity) hkl]: 3.146 (100) 112, 2.912 (13) 004, 2.652 (18) 200, 1.964 (34) 204, 1.875 (15) 220, 1.728 (19) 116, and 1.616 (28) 312 and 132. Unit-cell parameters, refined from the powder X-ray diffraction data in a tetragonal setting, space group I4 (sub 1) /a, are a = 5.296(1), c = 11.673(2)Aa, V = 327.4(1)Aa (super 3) , Z = 4. Owing to the lack of suitable crystals and the very small amount of available material, the crystal structure of suseinargiuite was not solved. However, X-ray powder diffraction data, micro-Raman spectra, as well as chemical analysis, show the close correspondence between suseinargiuite with synthetic (Na (sub 0.5) Bi (sub 0.5) )MoO (sub 4) , which displays a scheelite-type structure.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 27
Serial Issue: 5
Title: Suseinargiuite, (Na (sub 0.5) Bi (sub 0.5) )MoO (sub 4) , the Na-Bi analogue of wulfenite, from Su Seinargiu, Sardinia, Italy
Affiliation: Universita di Pisa, Dipartimento di Scienze della Terra, Pisa, Italy
Pages: 695-699
Published: 20150707
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 21
Accession Number: 2015-082111
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N39°04'53" - N39°04'53", E08°58'36" - E08°58'36"
Secondary Affiliation: Universite de Nantes, FRA, FranceInstitut Universitaire Europeen de la Mer, FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201535
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