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- Title
Modular Structure of a Potassium-Rich Analogue of Eudialyte with a Doubled Parameter c.
- Authors
Rastsvetaeva, R. K.; Khomyakov, A. P.
- Abstract
The structure of a new potassium-rich representative of the eudialyte group described by the idealized formula Na[sub 27]K[sub 8]Ca[sub 12]Fe[sub 3]Zr[sub 6][Si[sub 52]O[sub 144]](O, OH, H[sub 2]O)[sub 6]Cl[sub 2] was established by the methods of the X-ray diffraction analysis (R = 0.045, 3900 reflections). The unit-cell parameters are a = 14.249(1) Å, c = 60.969(7) Å, V = 10 720.3 Å[sup 3] , sp. gr. R3m. The structure of the mineral is characterized by in-layer order in cation arrangement resulting in doubling of the parameter c and the formation of two different modules, of which one corresponds to composition and structure of eudialyte (with an admixture of kentbrooksite) and the other is the derivative of alluaivite. © 2001 MAIK “Nauka / Interperiodica”.
- Subjects
POTASSIUM compounds; CRYSTALLOGRAPHY; SILICATE minerals; EUDIALYTE
- Publication
Crystallography Reports, 2001, Vol 46, Issue 4, p647
- ISSN
1063-7745
- Publication type
Article
- DOI
10.1134/1.1387132