Abstract

The crystal structure of lanthanite, (La,Ce)2(CO3)3·8H2O, a=9.504(4), b=16.943(6), c=8.937(5) Å; space group Pbnb, Z=4, has been determined by Patterson and Fourier methods using 1022 intensities measured with an automatic diffractometer. The hydrogen atoms belonging to three of the four independent water molecules have been located in the difference Fourier map. The least-squares refinement led to a final R index of 0.025. The principal structural feature of lanthanite consists of infinite layers of RE–O coordination polyhedra and CO2−3 groups. These layers are parallel to the ac plane and are connected to one another only by hydrogen bonds. This feature accounts for the micaceous {010} cleavage.

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