Crystal structure of centrosymmetric 12-layer sodium-rich eudialyte

Journal Article · Fri May 15 00:00:00 EDT 2009 · Crystallography Reports

DOI:https://doi.org/10.1134/S1063774509030079· OSTI ID:22050838

Rozenberg, K A; Verin, I A ^[1]

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1. Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)

The structure of a new representative of the eudialyte group with the formula (Na,Sr,K){sub 18}Ca{sub 6}Zr{sub 3}Fe[Si{sub 25}O{sub 72}](OH){sub 2}Cl . H{sub 2}O from the Lovozero massif (Kola Peninsula) was studied by X-ray diffraction. The trigonal unit-cell parameters are a = 14.226 A, c = 30.339 A, sp. gr. R3-barm; the R factor is 0.045 based on 990 reflections. This sample is of interest as a sodium-rich and iron-poor mineral having a rare centrosymmetric structure, in which the M(2) site is occupied predominantly by sodium atoms. The dependence of the formation of centrosymmetric and non-centrosymmetric structures on the composition of eudialyte-group minerals was analyzed.

• OSTI ID: 22050838
• Journal Information: Crystallography Reports, Vol. 54, Issue 3; Other Information: Copyright (c) 2009 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7745
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
LAYERS
LOVOZERO
R FACTORS
REFLECTION
SILICATE MINERALS
TRIGONAL LATTICES
WATER
X-RAY DIFFRACTION