Dissymmetrization in eudialyte-group minerals. I. A model of ordered cation arrangement in the crystal structure of amableite-(Ce) using the P3 symmetry

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Abstract

The crystal structure of the recently discovered eudialyte group mineral, amabellite-(Ce) Na15[(Ce1.5Na1.5)Mn3]Mn2Zr3£Si[Si24O69(OH)3](OH)2 · H2O, found in the hyperagpaitic pegmatite of the Saint-Amable massif (Canada), has been solved by X-ray structural analysis within the space group R3. Amabellite-(Ce) is a member of the eudialyte group with the lowest calcium content and differs from other members of this group by the dominance of lanthanides in the part of the edge-sharing octahedra of the six-membered ring. The unit cell parameters of the mineral are: a = 14.1340(2), c = 30.378(1) Å, V = 5255.6(3) ų. A model of the cation distribution in the crystal structure of amabellite-(Ce) within the low-symmetry space group P3 has been proposed. The obtained 162 independent positions were refined in the isotropic-anisotropic approximation of atomic displacements using 3968 F > 3σ(F), R = 4.6%. Despite the fairly close results, the transition from space group R3 to P3 allows for more detailed information on the local distribution of a number of elements over the framework positions. A comparison was made between the crystal structure models of amabellite within the symmetries R3 and P3, as well as other low-calcium eudialyte group minerals previously studied within several space groups.

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About the authors

R. K. Rastsvetaeva

Shubnikov Institute of Crystallography, Kurchatov Complex of Crystallography and Photonics, National Research Centre “Kurchatov institute”

Author for correspondence.
Email: rast.crys@gmail.com
Russian Federation, Moscow

S. M. Aksenov

Kola Science Center, Russian Academy of Sciences

Email: rast.crys@gmail.com

Laboratory of Arctic Mineralogy and Material Sciences, Geological Institute

Russian Federation, Apatity

V. M. Gridchina

Shubnikov Institute of Crystallography, Kurchatov Complex of Crystallography and Photonics, National Research Centre “Kurchatov institute”

Email: rast.crys@gmail.com
Russian Federation, Moscow

N. V. Chukanov

FRC of Problems of Chemical Physics and Medicinal Chemistry, RAS

Email: rast.crys@gmail.com
Russian Federation, Chernogolovka

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2. Fig. 1. The ordering of Mn, Ca, Ce and Na in octahedra of a six-membered ring around three crystallographically independent axes of the third order and the distribution of M2 cations between them at a height of z ~0, ~0.33, ~0.66.

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