lAn X-ray single-crystal structural investigation on a sample of cancrinite of formula Na7.13Ca0.87(Si6Al6O24) (SO4)(0.07)(CO3)(1.43) . 2H(2)O has been carried out. The cancrinite cage content has been found to be similar to that reported in previous structure refinements on natural and synthetic samples. However, differently from reference data, cations located inside the uninterrupted channel are distributed between two independent sites M1 and M2. Moreover carbonate groups are distributed, with partial occupancy, between two different z elevations (C1-OC1 and C2-OC2). The tetrahedral co-ordination of the sulphate group is obtained by partial substitution of carbon atoms at C1 and C2 by sulphur and oxygen. Two possible orientation with the apical oxygen pointing "down" or "up" are possible.

The crystal structure of a "disordered" cancrinite / Ballirano, Paolo; Maras, Adriana. - In: EUROPEAN JOURNAL OF MINERALOGY. - ISSN 0935-1221. - STAMPA. - 16:1(2004), pp. 135-141. [10.1127/0935-1221/2004/0016-0135]

The crystal structure of a "disordered" cancrinite

BALLIRANO, Paolo;MARAS, Adriana
2004

Abstract

lAn X-ray single-crystal structural investigation on a sample of cancrinite of formula Na7.13Ca0.87(Si6Al6O24) (SO4)(0.07)(CO3)(1.43) . 2H(2)O has been carried out. The cancrinite cage content has been found to be similar to that reported in previous structure refinements on natural and synthetic samples. However, differently from reference data, cations located inside the uninterrupted channel are distributed between two independent sites M1 and M2. Moreover carbonate groups are distributed, with partial occupancy, between two different z elevations (C1-OC1 and C2-OC2). The tetrahedral co-ordination of the sulphate group is obtained by partial substitution of carbon atoms at C1 and C2 by sulphur and oxygen. Two possible orientation with the apical oxygen pointing "down" or "up" are possible.
2004
cancrinite; cancrinite group; cancrinite-group; crystal structure; crystal structure.; feldspathoids
01 Pubblicazione su rivista::01a Articolo in rivista
The crystal structure of a "disordered" cancrinite / Ballirano, Paolo; Maras, Adriana. - In: EUROPEAN JOURNAL OF MINERALOGY. - ISSN 0935-1221. - STAMPA. - 16:1(2004), pp. 135-141. [10.1127/0935-1221/2004/0016-0135]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/238526
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