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


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.

Research Article
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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Bari, H., Cesbron, F., Moelo, Y., Permingeat, F., Picot, P., Pierrot, R., Schubnel, H.J. and Weil, R. (1983) La dervillite, Ag2AsS2, nouvelle définition de l’espèce. Bullettin de Minéralogie, 106, 519524.CrossRefGoogle Scholar
Bindi, L., Evain, M. and Menchetti, S. (2006) Temperature dependence of the silver distribution in the crystal structure of natural pearceite, (Ag,Cu)16(As,Sb)2S11. Acta Crystallographica, B62, 212219.CrossRefGoogle Scholar
Bindi, L., Evain, M. and Menchetti, S. (2007) Complex twinning, polytypism and disorder phenomena in the crystal structures of antimonpearceite and arsenpolybasite. The Canadian Mineralogist, 45, 321333.CrossRefGoogle Scholar
Bindi, L., Catelani, T., Chelazzi, L. and Bonazzi, P. (2008) Reinvestigation of the crystal structure of lautite, CuAsS. Acta Crystallographica, E64, i22.Google Scholar
Bindi, L., Downs, R.T. and Menchetti, S. (2010a) The crystal structure of billingsleyite, Ag7(As,Sb)S6, a sulfosalt containing As5+ . The Canadian Mineralogist, 48, 155162.CrossRefGoogle Scholar
Bindi, L., Nestola, F., Guastoni, A. and Secco, L. (2010b) The crystal structure of dalnegroite, Tl5–xPb2x (As,Sb)21–xS34: A masterpiece of structural complexity. Mineralogical Magazine, 74, 9991012.CrossRefGoogle Scholar
Bindi, L., Nestola, F., Guastoni, A., Peruzzo, L., Ecker, M. and Carampin, R. (2012a) Raberite, Tl5Ag4As6SbS15, a new Tl-bearing sulfosalt from Lengenbach quarry, Binn Valley, Switzerland: description and crystal structure. Mineralogical Magazine, 76, 11531163.CrossRefGoogle Scholar
Bindi, L., Nestola, F., Guastoni, A., Zorzi, F., Peruzzo, L. and Raber, T. (2012b) Te-rich canfieldite, Ag8Sn(S,Te)6, from Lengenbach quarry, Binntal, Canton Valais, Switzerland: Occurrence, description and crystal structure. The Canadian Mineralogist, 50, 111118.CrossRefGoogle Scholar
Bindi, L., Spry, P.G., Bonazzi, P., Makovicky, E. and Balić-Žunić, T. (2013) Quadratite, AgCdAsS3: Chemical composition, crystal structure and OD character. American Mineralogist, 98, 242247.CrossRefGoogle Scholar
Bonazzi, P. and Bindi, L. (2008) A crystallographic review of arsenic sulfides: Effects of chemical variations and changes induced by light exposure. Zeitschrift für Kristallographie, 223, 132147.Google Scholar
Bonazzi, P., Borrini, D., Mazzi, F. and Olmi F. (1995) Crystal structure and twinning of Sb2AsS2, the synthetic analogue of pääkkonenite. American Mineralogist, 80, 10541058.CrossRefGoogle Scholar
Downs, R.T., Bartelmehs, K.L., Gibbs, G.V. and Boisen, M.B., Jr. (1993) Interactive software for calculating and displaying X-ray or neutron powder diffractometer patterns of crystalline materials. American Mineralogist, 78, 11041107.Google Scholar
Engel, P. and Nowacki, W. (1966) Die Verfeinerung der Kristallstruktur von Proustit, Ag3AsS3, und Pyrargyrit, Ag3SbS3. Neues Jahrbuch für Mineralogie Monatshefte, 1966, 181195.Google Scholar
Flack, H.D., Bernardinelli, G., Clemente, D.A., Lindenc, A. and Spek, A.L. (2006) Centrosymmetric and pseudo-centrosymmetric structures refined as noncentrosymmetric. Acta Crystallographica, B62, 695701.CrossRefGoogle Scholar
Graeser, S., Cannon, R., Drechsler, E., Raber, T. and Roth, P. (2008) Faszination Lengenbach Abbau- Forschung-Mineralien 1958–2008. Kristallographik Verlag, Achberg, Germany.Google Scholar
Guastoni, A., Bindi, L. and Nestola, F. (2012) Debattistiite, Ag9Hg0.5As6S12Te2, a new Te-bearing sulphosalt from Lengenbach quarry, Binn valley, Switzerland: Description and crystal structure. Mineralogical Magazine, 76, 743750.CrossRefGoogle Scholar
Ibers, J.A. and Hamilton, W.C. Eds. (1974) International Tables for X-ray Crystallography, vol. IV, 366 p. Kynock, Dordrecht, The Netherlands.Google Scholar
Makovicky, E., Johan, Z. and Karup-Møller, S. (1980) New data on bukovite, thalcusite, chalcothallite and rohaite. Neues Jahrbuch für Mineralogie Abhandlungen, 138, 122146.Google Scholar
Müller, P., Herbst-Irmer, R., Spek, A.L., Schneider, T.R. and Sawaya, M.R. (2006) Crystal Structure Refinement, a Crystallographer’s Guide to SHELXL. Oxford University Press (for IUCr), London, 213 pp.CrossRefGoogle Scholar
Nestola, F., Guastoni, A., Bindi, L. and Secco L. (2010) Dalnegroite, Tl5-xPb2x(As,Sb)21-xS34, a new thallium sulphosalt from Lengenbach quarry, Binntal, Canton Valais, Switzerland. Mineralogical Magazine, 73, 10271032.CrossRefGoogle Scholar
Ribár, B. and Nowacki, W. (1970) Die Kristallstruktur von Stephanit, [Sb S 3 | S | A g 5 I I I ]. A ct a Crystallographica, B26, 201207.Google Scholar
Shannon, R.D. (1976) Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides. Acta Crystallographica, A32, 751767.CrossRefGoogle Scholar
Sheldrick, G.M. (2008) A short history of SHELX. Acta Crystallographica, A64, 112122.CrossRefGoogle Scholar
Weil, R. (1941) La dervillite, espèce minérale nouvelle. Revue des Sciences Naturelles d’Auvergne, Clermont Ferrand, 7, 110111.Google Scholar
Yang, H., Downs, R.T., Costin, G. and Eichler, C.M. (2007) Crystal structure and revision of chemical formula of tvalchrelidzeite, Hg3SbAsS3. The Canadian Mineralogist, 45, 15291533.CrossRefGoogle Scholar
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