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Parapierrotite from the Monte Arsiccio Mine (Apuan Alps, Tuscany, Italy); occurrence and new data on its crystal-chemistry

Cristian Biagioni, Yves Moelo, Natale Perchiazzi, Nicola Demitri and Federica Zaccarini
Parapierrotite from the Monte Arsiccio Mine (Apuan Alps, Tuscany, Italy); occurrence and new data on its crystal-chemistry
European Journal of Mineralogy (June 2019) Pre-Issue Publication

Abstract

A new finding of parapierrotite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy, is reported here. Parapierrotite was identified in two different samples, as striated prismatic crystals, black in colour, ranging from 0.05 to 0.5 mm in length. In the studied specimens, parapierrotite is associated with sphalerite, zinkenite, tetrahedrite, and routhierite or with stibnite, protochabournite, and routhierite. Chemical analysis indicated the presence of a Pb-bearing variety of parapierrotite; the electron microprobe data are (average of 15 spot analyses - in wt%): Tl 17.06(33), Pb 3.64(55), As 0.09(7), Sb 56.07(38), S 23.94(13), total 100.80(34). On the basis of Sigma Me = 6 atoms per formula unit, the chemical formula of Pb-bearing parapierrotite from the Monte Arsiccio mine is Tl (sub 0.89) (1)Pb (sub 0.19) (3)(Sb (sub 4.91) (13)As (sub 0.01) (1)) (sub Sigma 4.92) S (sub 7.96) (36), ideally Tl (sub 0.9) Pb (sub 0.2) Sb (sub 4.9) S (sub 8) . Its crystal structure study gave a monoclinic unit cell, space group Pn, with a = 8.1005(14), b = 19.4385(9), c = 9.0359(4) Aa, beta = 92.041(3) degrees , V = 1421.9(3) Aa (super 3) , Z = 4. The crystal structure was refined to R (sub 1) = 0.046 on the basis of 10461 reflections with F (sub o) > 4sigma (F (sub o) ) and 265 refined parameters. Parapierrotite belongs to the pierrotite-parapierrotite homeotypic pair. The refinement of the crystal structure of this Pb-bearing variety allowed the description of the mechanism favouring the hosting of Pb in one of the two (010) walls of (Tl,Sb) atom pairs of this Tl sulfosalt.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: Pre-Issue Publication
Title: Parapierrotite from the Monte Arsiccio Mine (Apuan Alps, Tuscany, Italy); occurrence and new data on its crystal-chemistry
Affiliation: Universita di Pisa, Dipartimento di Scienze della Terra, Pisa, Italy
Published: 20190622
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 39
Accession Number: 2019-063822
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables
N58°16'00" - N58°16'00", E10°17'05" - E10°17'05"
Secondary Affiliation: Universite de Nantes, FRA, FranceElettra-Sincrotrone Trieste, ITA, ItalyUniversity of Leoben, AUT, Austria
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201933
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