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Dervillite, Ag2AsS2, from Lengenbach quarry, Binn valley, Switzerland: occurrence and crystal structure

Published online by Cambridge University Press:  05 July 2018

L. Bindi ,
F. Nestola ,
L. De Battisti  and
A. Guastoni
L. Bindi*
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via G. La Pira 4, I-50121 Florence, Italy
F. Nestola
Affiliation:
Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, I-35131, Padua, Italy
L. De Battisti
Affiliation:
FGL (Forschungsgemeinschaft Lengenbach), Via dello Storno 18, I-20147 Milan, Italy
A. Guastoni
Affiliation:
Museo di Mineralogia, Università di Padova, Via Giotto 1, I-35122, Padua, Italy
*
* E-mail: [email protected]
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Abstract

Dervillite, As2AsS2, has been found in a sample from the Lengenbach quarry in the Binn Valley, Valais, Switzerland. It occurs as very rare crystals up to 200 μm across on jordanite. Dervillite is opaque with a metallic lustre and shows a dark brown streak. The structure is monoclinic, space group Pc, with a = 9.6155(7), b = 12.9331(8), c = 6.8616(5) A ˚ , b = 99.352(8)º, V = 842.0(1) Å3 and Z = 8. In the crystal structure [R1 = 0.060 for 2370 reflections with I > 2σ(I)], silver adopts various coordinations extending from quasi linear to quasi tetrahedral whereas arsenic forms very peculiar crystal-chemical environments, such as As(S2As) and As(S2AsAg). Such metalloid–metalloid or metal–metalloid bonds account for the apparent charge imbalance observed in the chemical formula.

Keywords

dervillitesilverLengenbachSwitzerland
Type
Research Article
Information
Mineralogical Magazine , Volume 77 , Issue 8 , December 2013 , pp. 3105 - 3112
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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