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Debattistiite, Ag (sub 9) Hg (sub 0.5) As (sub 6) S (sub 12) Te (sub 2) , a new Te-bearing sulfosalt from Lengenbach Quarry, Binn Balley, Switzerland; description and crystal structure

A. Guastoni, L. Bindi and F. Nestola
Debattistiite, Ag (sub 9) Hg (sub 0.5) As (sub 6) S (sub 12) Te (sub 2) , a new Te-bearing sulfosalt from Lengenbach Quarry, Binn Balley, Switzerland; description and crystal structure
Mineralogical Magazine (June 2012) 76 (3): 743-750

Abstract

Debattistiite, ideally Ag (sub 9) Hg (sub 0.5) As (sub 6) S (sub 12) Te (sub 2) , is a new mineral (IMA-CNMNC 2011-098) from the Lengenbach quarry in the Binn Valley, Valais, Switzerland. It occurs as very rare tabular euhedral crystals up to 150 mu m across in cavities in dolomitic marble, associated with realgar, rutile, trechmannite and hutchinsonite. Debattistiite is opaque with a metallic lustre and a grey streak. It is brittle; the Vickers hardness (VHN (sub 25) ) is 80 kg mm (super -2) (range: 65-94), corresponding to a Mohs hardness of 2-2 1/2. In reflected light debattistiite is dark grey, highly bireflectant and weakly pleochroic from dark grey to a slightly greenish grey. Between crossed polars it is highly anisotropic with brownish to blue rotation tints. Internal reflections are absent. Reflectance percentages for the four COM wavelengths (R (sub min) and R (sub max) ) are 27.2, 34.5 (471.1 nm), 25.5, 31.0 (548.3 nm), 22.9, 28.4 (586.6 nm), and 20.1, 25.2 (652.3 nm), respectively. Debattistiite is triclinic, space group P1i, with a = 7.832(5), b = 8.606(4), c = 10.755(5) Aa, alpha = 95.563(9), beta = 95.880(5), gamma = 116.79(4) degrees , V = 635.3(6) Aa (super 3) and Z = 1. The crystal structure [R (sub 1) = 0.0826 for 795 reflections with I > 2sigma (I)] consists of corner-sharing AsS (sub 3) pyramids forming three-membered distorted rings linked by Ag atoms in triangular or tetrahedral coordination. The five strongest powder-diffraction lines [d in Aa (I/I (sub 0) ) (hkl)] are as follows: 10.56 (6) (001); 3.301 (5) (2i12); 2.991 (4) (21i2); 2.742 (2i1i1) and 2.733 (10) (2i30). A mean of nine electron microprobe analyses gave: Ag 44.88, Hg 4.49, As 20.77, S 17.72, Te 11.82; total 99.68 wt.%, which corresponds to Ag (sub 9.02) Hg (sub 0.49) As (sub 6.012) S (sub 11.98) Te (sub 2.01) , on the basis of 29.5 atoms. The new mineral is named for Luca De Battisti, a systematic mineralogist and expert on the minerals of Lengenbach quarry.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 76
Serial Issue: 3
Title: Debattistiite, Ag (sub 9) Hg (sub 0.5) As (sub 6) S (sub 12) Te (sub 2) , a new Te-bearing sulfosalt from Lengenbach Quarry, Binn Balley, Switzerland; description and crystal structure
Affiliation: Universita degli Studi di Padova, Museo di Mineralogia, Padua, Italy
Pages: 743-750
Published: 201206
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 28
Accession Number: 2012-092181
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
N46°19'60" - N46°25'00", E08°05'60" - E08°13'60"
Secondary Affiliation: Universita degli Studi di Firenze, ITA, Italy
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201248
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