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On Indexing X-Ray Diffraction Powder Patterns of Cubic Lazurites with an Incommensurate-Modulated Structure

Published online by Cambridge University Press:  10 January 2013

A.N. Sapozhnikov ,
E.K. Vasil'ev  and
P. Bayliss
A.N. Sapozhnikov
Affiliation:
Institute of Geochemistry, Academy of Sciences, Siberian Department, Irkutsk 664033, Russia
E.K. Vasil'ev
Affiliation:
Institute of the Earth's Crust, Academy of Sciences, Siberian Department, Irkutsk 664033, Russia
P. Bayliss
Affiliation:
University of Calgary, Calgary, Alberta T2N 1N4, Canada
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Abstract

The modulation of the lazurite structure has been determined by X-ray diffraction methods. The indexing of satellites on X-ray diffraction powder patterns has been made by means of single crystal X-ray diffraction patterns. The irrationality of the satellite distance from the basic reflections in some specimens of isotropic lazurite confirms the incommensurability of the wavelength of modulation by an edge magnitude of the sodalite subcell and the necessity of a fractional mineral lattice. X-ray diffraction powder data of lazurites with different periods of incommensurate-modulated structure are established. Modulation structure parameters are 0.217 and 0.175, respectively. Indexing of X-ray diffraction powder data of cubic Baikal lazurite suggested by the PDF editorial staff is considered.

Type
Research Article
Information
Powder Diffraction , Volume 7 , Issue 3 , September 1992 , pp. 134 - 136
Copyright
Copyright © Cambridge University Press 1992

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