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- Title
Structural Characteristics of Na,Fe-Decationated Eudialyte with the Symmetry R3.
- Authors
Rastsvetaeva, R. K.; Khomyakov, A. P.
- Abstract
The crystal structure of a new highly decationated representative of the eudialyte group has been established (R = 0.055, 1734 F). The mineral is described by the simplified formula (H[sub 3]O)[sub 9]Na[sub 2](K,Ba,Sr)[sub 2]Ca[sub 6]Zr[sub 3][Si[sub 26]O[sub 66](OH)[sub 6](OH)[sub 3]Cl · H[sub 2]O (Z = 3). The unit-cell parameters are a = 14.078(3) Å, c = 31.24(1) Å; V= 5362 ų; sp. gr. R3. Being chemically and structurally related to the hydrated analogues studied previously (in particular, to potassium oxonium eudialyte), the new mineral differs from its analogues in that it has a higher degree of Na- and Fe-cation depletion. The replacement of 3/4 of Na cations by loose and mobile H[sub 3]O groups results in structure destabilization, which is seen from the high values of the thermal parameters of the atoms and the loss of the symmetry plane.
- Subjects
INORGANIC compounds; CHEMICAL structure; EUDIALYTE
- Publication
Crystallography Reports, 2002, Vol 47, Issue 2, p232
- ISSN
1063-7745
- Publication type
Article
- DOI
10.1134/1.1466498