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The Canadian Mineralogist; April 2002; v. 40; no. 2; p. 733-737; DOI: 10.2113/gscanmin.40.2.733
© 2002 Mineralogical Association of Canada
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Crystal Structures and Crystal Chemistry

THE CRYSTAL STRUCTURE OF COBALTARTHURITE, Co2+Fe3+2(AsO4)2(OH)2·4H2O: A RIETVELD REFINEMENT

Mati Raudsepp§ and Elisabetta Pani

Department of Earth and Ocean Sciences, The University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada

§ E-mail address: mraudsepp{at}eos.ubc.ca

The crystal structure of cobaltarthurite from near Pastrana, southeastern Spain [monoclinic, a 10.2694(4), b 9.6790(3), c 5.5723(2) Å, ß 94.277(2)°, P21/c], has been refined to Rwp and RB indices of 7.7 and 1.7%, respectively, using the Rietveld method and X-ray powder-diffraction data. Cobaltarthurite is a newly discovered Co-dominant analogue of arsenate members of the arthurite group, with ideal formula Co2+Fe3+2(AsO4)2(OH)2·4H2O. Results of the Rietveld refinement confirm that cobaltarthurite is isostructural with other members of the group. Electron-probe micro-analyses show that the formula is of ideal stoichiometry, with minor substitution of Mg, Mn, Ni, Cu and Ca for Co, and trace P and S substitution for As.

Keywords: cobaltarthurite, arsenate, chemical analysis, arthurite group, crystal structure, Rietveld refinement, X-ray powder-diffraction.




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