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X-ray powder diffraction data of hauyne with incommensurate modulated structure from volcanic rocks of Laacher Lake, Germany

Published online by Cambridge University Press:  10 January 2013

A. N. Sapozhnikov ,
V. G. Ivanov ,
L. F. Piskunova  and
E. K. Vasil'ev
A. N. Sapozhnikov
Affiliation:
Institute of Geochemistry, Russian Academy of Sciences, Siberian Branch Irkutsk, 664033, Russia
V. G. Ivanov
Affiliation:
Institute of Geochemistry, Russian Academy of Sciences, Siberian Branch Irkutsk, 664033, Russia
L. F. Piskunova
Affiliation:
Institute of Geochemistry, Russian Academy of Sciences, Siberian Branch Irkutsk, 664033, Russia
E. K. Vasil'ev
Affiliation:
Institute of the Earth's Crust, Russian Academy of Sciences, Siberian Branch, Irkutsk, 664033, Russia
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Abstract

Methods of the structure analysis were used to determine the incommensurate structure modulation in a sample of hauyne from Laacher Lake, Germany. The modulation parameter n=0.145, determined using single-crystal patterns, was refined using powder data. An indexing technique for additional reflections (satellites) using a parameter subcell and Miller index main reflections was suggested. Crystallographic characteristics of the hauyne of Laacher Lake are compared with that of hauyne from Sacrafano (Italy) and with lazurtes from Baikal, Pamir, and Afghanistan. We found that the crystal structure modulation can serve as a source of paragenesis information on sulphate bearing sodalte group minerals.

Type
Research Article
Information
Powder Diffraction , Volume 12 , Issue 1 , March 1997 , pp. 3 - 6
Copyright
Copyright © Cambridge University Press 1997

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