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The crystal structure of cesanite, Ca1+xNa4−x(SO4)3(OH)x · (1 − x)H2O, a sulphate isotypic to apatite

Published online by Cambridge University Press:  05 July 2018

V. Tazzoli
V. Tazzoli*
Affiliation:
Centro di Studio per la Cristallografia Strutturale del CNR c/o Istituto di Mineralogia dell'Universita', Via Bassi, 4-27100 Pavia, Italy
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Abstract

Cesanite, Ca1+xNa4−x(SO4)3(OH)x · (1 − x) H2O, is hexagonal, space group P63/m, a = 9.446(1) and c = 6.895(1) Å, Z = 2. The crystal structure refinement, carried out by utilizing 457 independent reflections (final R = 0.021), shows that cesanite is isotypic to hydroxyapatite. The P atom of apatite is completely replaced in cesanite by an S atom; the two independent Ca sites of apatite are occupied respectively by Na and Na + Ca, the charge balance being by partial substitution of H2O for OH− although the occupancy of the (H2O,OH−) sites is not complete. The relationship between the water vacancies and the structural features of the (Ca,Na) polyhedron is discussed. A new general formula for the apatite-wilkeite-ellestadite series is proposed.

Type
Research Article
Information
Mineralogical Magazine , Volume 47 , Issue 342 , March 1983 , pp. 59 - 63
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1983

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