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Rietveld refinement of chapmanite SbFe2Si2O8OH, a TO dioctahedral kaolinite-like mineral

Published online by Cambridge University Press:  10 January 2013

P. Ballirano ,
A. Maras ,
F. Marchetti ,
S. Merlino  and
N. Perchiazzi
P. Ballirano
Affiliation:
Corso Duca di Genova 147, I-00121, Roma, Italy
A. Maras
Affiliation:
Dipartimento di Scienze della Terra, Università di Roma “La Sapienza,” P. le A. Moro 5, I-00185, Roma, Italy
F. Marchetti
Affiliation:
Dipartimento di Chimica e Chimica Industriale, Università di Pisa, V. Risorgimento 35, I-56126, Pisa, Italy
S. Merlino
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, V. S. Maria 53, I-56126, Pisa, Italy
N. Perchiazzi
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, V. S. Maria 53, I-56126, Pisa, Italy
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Abstract

Chapmanite, Sb(OH)Fe2(SiO4)2 is a rare mineral that generally occurs as yellow coatings on rocks from antimony mines. The very small dimensions of the crystals prevented X-ray, single-crystal study of the mineral whose structure was derived through high voltage electron diffraction (Zhukhlistov and Zvyagin, 1977). The present study confirm the correctness of the structure determined by those authors and also shows the effectiveness of the Rietveld method in the case of highly diluted phases. The structure of chapmanite is similar to that of kaolinite with two major differences: (a) the dioctahedral sheet of chapmanite contains Fe3+ instead of Al3+; (b) chapmanite has cations grasped to the octahedral sheet, on the opposite side with respect to the tetrahedral sheet.

Type
Research Article
Information
Powder Diffraction , Volume 13 , Issue 1 , March 1998 , pp. 44 - 49
Copyright
Copyright © Cambridge University Press 1998

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