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Reappraisal of the space group of bafertisite

Published online by Cambridge University Press:  10 January 2013

Zhuming Yang ,
Gordon Cressey  and
Mark Welch
Zhuming Yang*
Affiliation:
Department of Mineralogy, The Natural History Museum, London, United Kingdom
Gordon Cressey
Affiliation:
Department of Mineralogy, The Natural History Museum, London, United Kingdom
Mark Welch
Affiliation:
Department of Mineralogy, The Natural History Museum, London, United Kingdom
*
a)Correspondence to: Zhuming Yang, Institute of Geology, The Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China.
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Abstract

Bafertisite, Ba(Fe, Mn)2Ti(Si2O7)O(OH, Cl)2, has been reported as belonging to three space groups, i.e., Pmmn, P21/m, and Cm. The samples of bafertisite from the original locality Bayan Obo, Inner Mongolia, and from Jiangsu Province, China, were reinvestigated by X-ray methods. On the basis of single-crystal photographs, Pmmn could be ruled out and the relationship between a subcell in P21/m and the true cell in Cm deduced. The transformation matrix from the subcell to the true cell is 002/02¯0/101¯. Using the X-ray powder data, the refined true unit cell parameters in space group Cm are: a=10.612(3), b=13.637(7), c=12.464(2) Å, β=119.49(2)° for Bayan Obo sample, and a=10.633(6), b=13.67(1), c=12.465(5) Å, β=119.55(4)° for the Jiangsu sample. The 00l-reflections, which are rather prominent due to preferred orientation, can only be explained by our new unit cell.

Keywords

bafertisitespace groupBayan Obo (China)
Type
Research Article
Information
Powder Diffraction , Volume 14 , Issue 1 , March 1999 , pp. 22 - 24
Copyright
Copyright © Cambridge University Press 1999

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