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:
-
- 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}
}