The crystal chemistry of the M+VO3 (M+ = Li,Na, K,NH4, Tl,Rb, and Cs) pyroxenes |
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| Authors: | FC Hawthorne C Calvo |
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| Institution: | Department of Earth Sciences, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2;Department of Chemistry, McMaster University, Hamilton, Ontario, Canada L8S 4M1 |
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| Abstract: | The crystal structures of M+VO3(M+ = K, NH4, and Cs) have been refined using three-dimensional counter-diffractometer X-ray data and full-matrix least-squares methods. The structure of these compounds is characterized by a (V5+O2?3)?∞ chain extending along the c-axis (Pbcm orientation), with adjacent chains linked by the alkali metal cation. The structure may be considered as a variant of the pyroxene structure, and standard atom nomenclature is proposed in order to facilitate comparison with silicate pyroxenes. Structural variation across this series is discussed in detail and is compared with the analogous M+M3+Si2O6 (M+ = Li, Na; M3+ = Al, Cr, Fe, Sc, In) series. |
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