Skip to Main Content
GEOREF RECORD

Heptasartorite, Tl (sub 7) Pb (sub 22) As (sub 55) S (sub 108) , enneasartorite, Tl (sub 6) Pb (sub 32) As (sub 70) S (sub 140) and hendekasartorite, Tl (sub 2) Pb (sub 48) As (sub 82) S (sub 172) , three members of the anion-omission series of 'sartorites' from the Lengenbach Quarry at Binntal, Wallis, Switzerland

Dan Topa, Emil Makovicky, Berthold Stoeger and Chris Stanley
Heptasartorite, Tl (sub 7) Pb (sub 22) As (sub 55) S (sub 108) , enneasartorite, Tl (sub 6) Pb (sub 32) As (sub 70) S (sub 140) and hendekasartorite, Tl (sub 2) Pb (sub 48) As (sub 82) S (sub 172) , three members of the anion-omission series of 'sartorites' from the Lengenbach Quarry at Binntal, Wallis, Switzerland (in Chromitites, platinum-group elements, and ore minerals; special issue dedicated to Zdenek Johan (1935-2016), Vojtech Ettler (prefacer) and Reto Giere (prefacer))
European Journal of Mineralogy (August 2017) 29 (4): 701-712

Abstract

Detailed electron-microprobe investigations and crystal-structure determinations established that 'sartorite' represents a group of distinct mineral species, each with unique chemistry and crystal structure. These manifest themselves as the 7-, 9- and 11-fold P2 (sub 1) /c superstructures of the basic 4.2 A substructure. Heptasartorite is Tl (sub 7) Pb (sub 22) As (sub 55) S (sub 108) [based on 192 atoms per formula unit (apfu), 84Me + 108S] with a = 29.269(2), b = 7.8768(5), c = 20.128(2) A, beta = 102.065(2) degrees and unit-cell volume V = 4537.8 A (super 3) ; enneasartorite is Tl (sub 6) Pb (sub 32) As (sub 70) S (sub 140) (based on 248 apfu, 108Me + 140S) with a = 37.612(6), b = 7.8777(12), c = 20.071(3) A, beta = 101.930(2) degrees and V = 5818.6(15) A (super 3) ; hendekasartorite is Tl (sub 2) Pb (sub 48) As (sub 82) S (sub 172) (based on 304 apfu, 132Me + 172S) (empirical Sigma Me = 132.48) with a = 31.806(5), b = 7.889(12), c = 28.556(4) A and beta = 99.034(2) degrees with V = 7076.4(15) A (super 3) Physical and optical properties (grey with metallic lustre, in polished section white with visible bireflectance, red internal reflections; reflectance curves span 28.7-42.5%; Mohs hardness 3-31/2) of these phases are very similar so that chemical analysis and/or single-crystal X-ray diffraction is needed to distinguish them. A brief description of complicated As (sub m) S (sub n) crank-shaft chains in the walls of double-ribbons which form the As-based slabs of these structures is given. The three new mineral species differ in their structures by 4.2 A modular increments, not just by cation substitutions. They represent anion-omission derivatives of the 'ideal' PbAs (sub 2) S (sub 4) composition with an important role for thallium in charge compensation. The described minerals belong to the late sulfide phases in the Pb-Tl-Ag-As deposit of Lengenbach, Wallis, Switzerland.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 29
Serial Issue: 4
Title: Heptasartorite, Tl (sub 7) Pb (sub 22) As (sub 55) S (sub 108) , enneasartorite, Tl (sub 6) Pb (sub 32) As (sub 70) S (sub 140) and hendekasartorite, Tl (sub 2) Pb (sub 48) As (sub 82) S (sub 172) , three members of the anion-omission series of 'sartorites' from the Lengenbach Quarry at Binntal, Wallis, Switzerland
Title: Chromitites, platinum-group elements, and ore minerals; special issue dedicated to Zdenek Johan (1935-2016)
Author(s): Topa, DanMakovicky, EmilStoeger, BertholdStanley, Chris
Author(s): Ettler, Vojtechprefacer
Author(s): Giere, Retoprefacer
Affiliation: Naturhistorisches Museum, Vienna, Austria
Affiliation: Charles University, Prague, Czech Republic
Pages: 701-712
Published: 201708
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 35
Accession Number: 2017-090047
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N46°21'54" - N46°21'54", E08°13'15" - E08°13'15"
Secondary Affiliation: University of Copenhagen, DNK, DenmarkTechnische Universitaet Wien, AUT, AustriaNatural History Museum, GBR, United Kingdom
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: 201747
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal