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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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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Sobre autores

R. Rastsvetaeva

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

Autor responsável pela correspondência
Email: rast.crys@gmail.com
Rússia, Moscow

S. Aksenov

Kola Science Center, Russian Academy of Sciences

Email: rast.crys@gmail.com

Laboratory of Arctic Mineralogy and Material Sciences, Geological Institute

Rússia, Apatity

V. Gridchina

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

Email: rast.crys@gmail.com
Rússia, Moscow

N. Chukanov

FRC of Problems of Chemical Physics and Medicinal Chemistry, RAS

Email: rast.crys@gmail.com
Rússia, 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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