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Title: Average structure of incommensurately modulated monoclinic lazurite

Abstract

The average structure of the monoclinic modification of lazurite Ca{sub 1.26}Na{sub 6.63}K{sub 0.04}[Al{sub 6}Si{sub 6}O{sub 24}](SO{sub 4}){sub 1.53}S{sub 0.99}Cl{sub 0.05} (discovered in the Lake Baikal region) incommensurately modulated along the c axis is solved by the single-crystal X-ray diffraction method. The unit-cell parameters are a = 9.069(1) A, b = 12.868(1) A, c = 12.872(1) A, {gamma} = 90.19(1) deg., sp. gr. Pa, R = 6.9%, 2057 reflections. The AlO{sub 4} and SiO{sub 4} tetrahedra form a partially ordered framework. The positions in the cavities of the framework are split and randomly occupied by Na and Ca atoms and the SO{sub 4}, S{sub 2}, S{sub 3}, and SO{sub 2} anionic groups. The structure of the mineral is compared with the superstructure of triclinic lazurite. Conclusions are drawn about the causes of the incommensurate modulation in monoclinic and other lazurites.

Authors:
;  [1]
  1. Russian Academy of Sciences, Vinogradov Institute of Geochemistry, Siberian Division (Russian Federation)
Publication Date:
OSTI Identifier:
21091465
Resource Type:
Journal Article
Journal Name:
Crystallography Reports
Additional Journal Information:
Journal Volume: 51; Journal Issue: 4; Other Information: DOI: 10.1134/S1063774506040080; Copyright (c) 2006 Nauka/Interperiodica; Article Copyright (c) 2006 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7745
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALCIUM COMPOUNDS; LAKE BAIKAL; MONOCLINIC LATTICES; MONOCRYSTALS; POTASSIUM COMPOUNDS; REFLECTION; SILICATE MINERALS; SILICATES; SODIUM COMPOUNDS; SULFATES; SULFIDES; TRICLINIC LATTICES; X-RAY DIFFRACTION

Citation Formats

Bolotina, N B, Rastsvetaeva, R. K., and Sapozhnikov, A N. Average structure of incommensurately modulated monoclinic lazurite. United States: N. p., 2006. Web. doi:10.1134/S1063774506040080.
Bolotina, N B, Rastsvetaeva, R. K., & Sapozhnikov, A N. Average structure of incommensurately modulated monoclinic lazurite. United States. https://doi.org/10.1134/S1063774506040080
Bolotina, N B, Rastsvetaeva, R. K., and Sapozhnikov, A N. 2006. "Average structure of incommensurately modulated monoclinic lazurite". United States. https://doi.org/10.1134/S1063774506040080.
@article{osti_21091465,
title = {Average structure of incommensurately modulated monoclinic lazurite},
author = {Bolotina, N B and Rastsvetaeva, R. K. and Sapozhnikov, A N},
abstractNote = {The average structure of the monoclinic modification of lazurite Ca{sub 1.26}Na{sub 6.63}K{sub 0.04}[Al{sub 6}Si{sub 6}O{sub 24}](SO{sub 4}){sub 1.53}S{sub 0.99}Cl{sub 0.05} (discovered in the Lake Baikal region) incommensurately modulated along the c axis is solved by the single-crystal X-ray diffraction method. The unit-cell parameters are a = 9.069(1) A, b = 12.868(1) A, c = 12.872(1) A, {gamma} = 90.19(1) deg., sp. gr. Pa, R = 6.9%, 2057 reflections. The AlO{sub 4} and SiO{sub 4} tetrahedra form a partially ordered framework. The positions in the cavities of the framework are split and randomly occupied by Na and Ca atoms and the SO{sub 4}, S{sub 2}, S{sub 3}, and SO{sub 2} anionic groups. The structure of the mineral is compared with the superstructure of triclinic lazurite. Conclusions are drawn about the causes of the incommensurate modulation in monoclinic and other lazurites.},
doi = {10.1134/S1063774506040080},
url = {https://www.osti.gov/biblio/21091465}, journal = {Crystallography Reports},
issn = {1063-7745},
number = 4,
volume = 51,
place = {United States},
year = {Sat Jul 15 00:00:00 EDT 2006},
month = {Sat Jul 15 00:00:00 EDT 2006}
}