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Lead-antimony sulfosalts from Tuscany (Italy); III, Pillaite, Pb (sub 9) Sb (sub 10) S (sub 23) ClO (sub 0.5) , a new Pb-Sb oxy-chloro-sulfosalt, from Buca della Vena Mine

Paolo Orlandi, Yves Moelo, Alain Meerschaut and Pierre Palvadeau
Lead-antimony sulfosalts from Tuscany (Italy); III, Pillaite, Pb (sub 9) Sb (sub 10) S (sub 23) ClO (sub 0.5) , a new Pb-Sb oxy-chloro-sulfosalt, from Buca della Vena Mine
European Journal of Mineralogy (June 2001) 13 (3): 605-610

Abstract

The new mineral pillaite, Pb (sub 9) Sb (sub 10) S (sub 23) ClO (sub 0.5) , an oxy-chloro-sulfosalt, has been found at Buca della Vena mine in the Apuan Alps, northern Tuscany, Italy. It crystallized in small fractures of dolomitic lenses in massive Fe-Ba ore, together with many Pb-Sb sulfosalts, among which the oxy-sulfosalt scainiite. Pillaite occurs as black acicular crystals with metallic lustre, elongated // [010], up to 1 cm long and less than 0.1 mm thick. The mineral is brittle, opaque; VHN (sub 50) = 175 kg/mm (super 2) , d (sub calc) = 5.77 g/cm (super 3) . In reflected light it shows a weak anisotropy and bireflectance, and rare red internal reflections. Electron-microprobe analysis (wt. %): Pb 49.07, Sb 30.36, Cu 0.16, S18.73, Cl 0.98, O (crystal structure) 0.21, Sum 99.51. Empirical formula: Pb (sub 9.30) Sb (sub 9.80) Cu (sub 0.10) S (sub 22.94) Cl (sub 1.06) O (sub 0.5) ; ideally: Pb (sub 9) Sb (sub 10) S (sub 23) ClO (sub 0.5) . Pillaite is monoclinic, space group C2/m, a = 49.65(3) Aa; b = 4.150(4) Aa; c = 21.91(1) Aa; beta = 99.76(5) degrees ; V = 4449(10) Aa (super 3) ; Z = 4. The strongest lines of the X-ray powder diffraction pattern are (d (Aa), I (sub obs) , hkl): 4.14 (27) (205), 3.88 (20) (1201), 3.621 (26) (406, 1202), 3.548 (40) (1204, 1005), 3.480 (100) (206), 3.249 (24) (1205), 2.956 (47) (515, 1601, 1206, 514), 2.780 (22) (1310, 515). Pillaite belongs to the zinkenite group. Like for dadsonite and other chloro-sulfides, the formation of this mineral is related to a high chlorinity of the hydrothermal solution, but also to the oxygen fugacity, as for scainiite.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 13
Serial Issue: 3
Title: Lead-antimony sulfosalts from Tuscany (Italy); III, Pillaite, Pb (sub 9) Sb (sub 10) S (sub 23) ClO (sub 0.5) , a new Pb-Sb oxy-chloro-sulfosalt, from Buca della Vena Mine
Affiliation: Universita di Pisa, Dipartimento di Scienze della Terra, Pisa, Italy
Pages: 605-610
Published: 200106
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 16
Accession Number: 2001-055185
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N42°19'60" - N44°19'60", E09°40'00" - E12°25'00"
Secondary Affiliation: CNRS, FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200117
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