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The crystal chemistry of duftite, PbCuAsO4(OH) and the β-duftite problem

Published online by Cambridge University Press:  05 July 2018

Kharisun ,
Max R. Taylor ,
D. J. M Bevan  and
Allan Pring
Kharisun
Affiliation:
Department of Chemistry, The Flinders University of South Australia, GPO Box 2100 Adelaide, S. A. 5001, Australia
Max R. Taylor
Affiliation:
Department of Chemistry, The Flinders University of South Australia, GPO Box 2100 Adelaide, S. A. 5001, Australia
D. J. M Bevan
Affiliation:
Department of Chemistry, The Flinders University of South Australia, GPO Box 2100 Adelaide, S. A. 5001, Australia
Allan Pring
Affiliation:
Department of Mineralogy, South Australian Museum, North Terrace, S. A. 5000, Australia
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Abstract

Duftite, PbCu(AsO4)(OH) is orthorhombic, space group P212121 with a = 7.768(1), b = 9. 211(1), c = 5.999(1) Å, Z = 4; the structure has been refined to R = 4.6% and Rw = 6.5% using 640 observed reflections [F> 2σ(F)]. The structure consists of chains of edge-sharing CuO6 ‘octahedra’, parallel to c; which are linked via AsO4 tetrahedra and Pb atoms in distorted square antiprismatic co-ordination to form a three dimensional network. The CuO6 ‘octahedra’ show Jahn-Teller distortion with the elongation running approximately along <627>. The hydrogen bonding network in the structure was characterized using bond valence calculations. ‘β-duftite’ is an intermediate in the duftite-conichalcite series, which has a modulated structure based on the intergrowth of the two structures in domains of approximately 50 Å. The origin of the modulation is thought to be associated with displacements in the oxygen lattice and is related to the orientation of the Jahn-Teller distortion of CuO6 ‘octahedra’. Approximately half of the strips show an elongation parallel to <627> while the other strips are elongated parallel to [010]. This ordering results in an increase in the b cell repeat compared to duftite and conichalcite.

Keywords

duftiteconichalcitecrystal structurecrystal chemistrymodulated structure
Type
Research Article
Information
Mineralogical Magazine , Volume 62 , Issue 1 , February 1998 , pp. 121 - 130
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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Footnotes

*

Permanent address: Fakultas Pertanian, Universitas Djenderal Soedirman, P.O. Box 125, Purwokerto 53123, Jawa-Tengah, Indonesia

References

Brown, I.D. and Altermatt, D. (1985) Bond valence parameters obtained from a systematic analysis of the inorganic crystal structure database. Acta Crystallogr., B41, 241–7.Google Scholar
Effenberger, H. (1987) Crystal structure and chemical formula of schmiederite, Pb2Cu2(OH)4(SeO3)(SeO4), with a comparison to linarite, PbCu(OH)2(SO4). Mineral. Petrol., 36, 3–12.CrossRefGoogle Scholar
Effenberger, H. and Pertlik, F. (1988) Comparison of the homeomorphic crystal structures of Pb(Fe,Mn) (VO4)(OH) = cechite and PbCu(AsO4)(OH) = duftite. Z. Kristallogr., 185, 610 (abstract).Google Scholar
Guillemin, C. (1956) Contribution a la minéralogie des arséniates, phosphates et vanadates de cuivre. 1 Arséniates de cuivre. Bull. Soc. fr. Minéral. Cristallogr., 79, 7–95.CrossRefGoogle Scholar
Hall, S.R., Flack, H.D. and Stewart, J.M. (Eds) (1992). Xtal3.2 Reference Manual. University of Western Australia, Perth, Australia.Google Scholar
Hawthorne, F.C. and Eby, R.K. (1985) Refinement of the crystal structure of lindgrenite, Neues Jahrb. Mineral. Mh., 234–40.Google Scholar
Hawthorne, F.C. and Faggiani, R. (1979) Refinement of the structure of descloizite. Acta Crystallogr., B35 717–20.CrossRefGoogle Scholar
Jambor, J.L., Owens, D.R. and Dutrizac, J.E. (1980) Solid solution in the adelite group of arsenates. Canad. Mineral., 18, 191–5.Google Scholar
Keller, P. (1977) Tsumeb, VI Paragenesis, Miner. Record, 8, 36–47.Google Scholar
Perez-Mato, G., Madariaga, G., Zuñiga, F.J. and Garcia Arribas, S.A. (1987) On the structure and symmetry of incommensurate Phases. a practical formulation. Acta Crystallogr., A43 216–26.CrossRefGoogle Scholar
Pertlik, F. (1989) The crystal structure of cechite, Pb(Fe2+,Mn2+)(VO4)(OH) with Fe>Mn. A mineral of the descloizite group. Neues Jahrb. Mineral. Mh., 34–40.Mn.+A+mineral+of+the+descloizite+group.+Neues+Jahrb.+Mineral.+Mh.,+34–40.>Google Scholar
Pring, A., Williams, T.B. and Withers, R.L. (1993) Structural modulation in sartorite: an electron microscope study. Amer. Mineral., 78, 619–26.Google Scholar
Pufahl, O. (1920) Mitteilungen über Mineralien und Erze von Südwestafrika, besonders solche von Tsumeb. Centralblatt für Mineralogie, Geologie, und Paläontologie, 289–96.Google Scholar
Putnis, A. (1992) Introduction to Mineral Sciences. Cambridge University Press, 434–7.CrossRefGoogle Scholar
Qurashi, M. M. and Barnes, W.H. (1963) The structures of the minerals of the descloizite and adelite groups: IV- Descloizite and conichalcite (Part 2) the structure of conichalcite. Canad. Mineral., 7, 561–77.Google Scholar
Radcliffe, D. and Simmons, W.B. Jr (1971) Austinite: chemistry and physical properties in relation to chonichalcite. Amer. Mineral., 56, 1359–65.Google Scholar
Richmond, W.E. (1940) Crystal chemistry of the phosphates, arsenates and vanadates of the type A2XO4(Z) Amer. Mineral., 25, 441–78.Google Scholar
Sokolova, E.V., Egorov-Tismenko, Y. K. and Yakhonoptova, P.K. (1982) Research on crystal structure of rare arsenates: duftite and mimetit. Vest. Mosk Univ. Ser., 4, 50–6.(Russian).Google Scholar
Taggart, J.E. and Foord, E.E. (1980) Conichalcite, cuprian austinite, and plumbian conichalcite from La Plata County, Colorado. Mineral. Record, 11, 37–8.Google Scholar
Withers, R.L. (1989) The characterization of modulated structures via their diffraction patterns. Prog. Crystal Growth Character., 18, 139–204.CrossRefGoogle Scholar
Zigan, F., Joswig, W., Schuster, H.D. and Mason, S.A. (1977) Verfeinerung der structure von malachit, Cu2(OH)4CO3 durch Neutronenbeugung. Z. Kristallogr., 145, 412–26.Google Scholar