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Molecular versus layered structure in arsenic sulphide minerals; the case of duranusite, As (sub 4) S

Paola Bonazzi, Giovanni O. Lepore and Luca Bindi
Molecular versus layered structure in arsenic sulphide minerals; the case of duranusite, As (sub 4) S
European Journal of Mineralogy (June 2015) 28 (1): 147-151

Abstract

Most of the natural and synthetic compounds belonging to the binary As-S system exhibit a structure based on the packing of discrete cage-like, covalently bonded As (sub 4) S (sub n) , whereas there are only few examples of layered structures. Here we report the crystal structure of duranusite, As (sub 4) S, which exhibits a new kind of layered structure related to that observed in one of the natural polymorphs of arsenic (arsenolamprite). Duranusite crystallizes in the Pmna space group [a = 3.611(5), b = 6.755(8), c = 10.10(1)Aa, alpha = beta = gamma = 90 degrees ], with 8 As and 2 S atoms per unit cell; the structure consists of an alternated stacking along the [010] axis of two kinds of corrugated layers which match the As (sub 2) and As (sub 2) S composition, respectively. The As-As bond distances range from 2.440 to 2.567Aa, while the As-S bond is 2.299 Aa. The shortest contact between adjacent layers is 3.101Aa, well below the sum of van der Walls radii. The crystal-structure determination of duranusite expands the number of the known layered structures of As sulphides suggesting that, in minerals and stable compounds, the As (sub 4) S (sub n) molecules are limited to those having n = 3, 4 and 5.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 28
Serial Issue: 1
Title: Molecular versus layered structure in arsenic sulphide minerals; the case of duranusite, As (sub 4) S
Affiliation: Universita degli Studi di Firenze, Dipartimento di Scienze della Terra, Florence, Italy
Pages: 147-151
Published: 20150629
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 27
Accession Number: 2015-082110
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
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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