Crystal structure of a new Mn, Na-ordered analogue of eudialyte with the symmetry R3

Citation
Rk. Rastsvetaeva et Ap. Khomyakov, Crystal structure of a new Mn, Na-ordered analogue of eudialyte with the symmetry R3, CRYSTALLO R, 45(4), 2000, pp. 591-594
Citations number
4
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
CRYSTALLOGRAPHY REPORTS
ISSN journal
10637745 → ACNP
Volume
45
Issue
4
Year of publication
2000
Pages
591 - 594
Database
ISI
SICI code
1063-7745(200007/08)45:4<591:CSOANM>2.0.ZU;2-0
Abstract
The crystal structure of a new representative of the eudialyte family was s tudied. This mineral is characterized by a low calcium content and by order ing the elements that isomorphically replace calcium, which lowers the symm etry from R3m to R3. The structure of the sample under study consists of th e six-membered rings with two octahedra of substantially different volumes, one occupied mainly by manganese and the other, mainly by sodium and chara cterized by the average distances of 2.22 and 2.45 Angstrom, respectively. The formation of such octahedra is the most characteristic structural featu re of the third low-symmetry mineral of the eudialyte family. (C) 2000 MIAI K "Nauka/Interperiodica".