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Nomenclature of the phosphoferrite structure type: refinements of landesite and kryzhanovskite

Published online by Cambridge University Press:  05 July 2018

P. B. Moore ,
T. Araki  and
A. R. Kampf
P. B. Moore
Affiliation:
Department of the Geophysical Sciences, The University of Chicago, Illinois 60637, USA
T. Araki
Affiliation:
Department of the Geophysical Sciences, The University of Chicago, Illinois 60637, USA
A. R. Kampf*
Affiliation:
Department of the Geophysical Sciences, The University of Chicago, Illinois 60637, USA
*
* Mineralogy-Geology Section, Los Angeles County Museum of Natural History, 900 Exposition Boulevard, Los Angeles, California 90007, USA
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Synopsis

The ideal end-members reddingite, Mn3 2+ H2 O)3(PO4)2, phosphoferrite, (H 2O)3(PO4)2, and kryzhanovskite, (OH)3(PO4)2 form a complex triple series. Similarities in crystal axes and pronounced differences in site preferences have led to erroneous indexing of the powder data and subsequent errors in cell refinements. Writing the general formula M(1)M(2)2[(H2O),(OH)]3(PO4)2, the following end-member names apply:

Type landesite,Ca0.4Mg1.2 (OH)3.2(H2O)8.8(PO4)8.0, has a = 9.458(3) Å, b = 10.185(2) Å, c = 8.543(2) Å, space group Pbna. R = 5.2% for 1821 independent reflexions (Mo-Kα radiation). The distance averages are M(1)-O = 2.098 Å, M(2)-O = 2.205 Å, P-O = 1.539 Å. Cotype kryzhanovskite,Ca0.5Mg0.4 (OH)7.3(H4O)4.7(PO4)8.0, has a = 9.450(2) Å, b = 10.013(2), c = 8.179(2). R = 7.2% for 1,703 independent reflexions (Mo-Kα radiation). The distance averages are M(1)-O = 2.017 Å, M(2)-O = 2.115, P-O = 1.542.

Computed powder pattern intensities from the structure data admitted extensive revisions of earlier published Miller indices and revised powder data are presented.

Information

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 330 , June 1980 , pp. 789 - 795
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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