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. 2013 Mar 1;69(Pt 3):i15-i16.
doi: 10.1107/S1600536813003164. Epub 2013 Feb 6.

Lanthanite-(Nd), Nd2(CO3)3·8H2O

Shaunna M Morrison  1 , Marcelo B Andrade, Michelle D Wenz, Kenneth J Domanik, Robert T Downs
Affiliations

Lanthanite-(Nd), Nd2(CO3)3·8H2O

Shaunna M Morrison et al. Acta Crystallogr Sect E Struct Rep Online. .

Abstract

Lanthanite-(Nd), ideally Nd2(CO3)3·8H2O [dineodymium(III) tricarbonate octa-hydrate], is a member of the lanthanite mineral group characterized by the general formula REE2(CO3)3·8H2O, where REE is a 10-coordinated rare earth element. Based on single-crystal X-ray diffraction of a natural sample from Mitsukoshi, Hizen-cho, Karatsu City, Saga Prefecture, Japan, this study presents the first structure determination of lanthanite-(Nd). Its structure is very similar to that of other members of the lanthanite group. It is composed of infinite sheets made up of corner- and edge-sharing of two NdO10-polyhedra (both with site symmetry ..2) and two carbonate triangles (site symmetries ..2 and 1) parallel to the ab plane, and stacked perpendicular to c. These layers are linked to one another only through hydrogen bonding involving the water mol-ecules.

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Figures

Fig. 1.
Fig. 1.
Looking down on a sheet of the lanthanite-(Nd) structure. NdO10 polyhedra are represented in blue and carbonate triangles are represented in green.
Fig. 2.
Fig. 2.
The crystal structure of lanthanite-(Nd) represented with displacement ellipsoids at the 99% probability level. Blue, green, red and cyan represent Nd, C, O atoms and H2O molecules, respectively.
Fig. 3.
Fig. 3.
Photograph of the lanthanite-(Nd) specimen analyzed in this study, illustrating its platy habit.
See this image and copyright information in PMC

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