| Autor: |
K. A. Rozenberg, Ramiza K. Rastsvetaeva, Alexander P. Khomyakov |
| Rok vydání: |
2006 |
| Předmět: |
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| Zdroj: |
European Journal of Mineralogy. 17:875-882 |
| ISSN: |
0935-1221 |
| DOI: |
10.1127/0935-1221/2005/0017-0875 |
| Popis: |
A collection of six decationized eudialytes from alkaline massifs of various regions was investigated by the single-crystal method. These samples differ from typical eudialytes by their low contents of alkaline and alkaline-earth cations and the high degree of hydration. The process of eudialyte decationization is accompanied by hydration, and hydrous species are incorporated into the mineral structure predominantly as H 3 O-groups. Those oxonium groups act as monovalent cations, replacing alkaline and alkaline-earth cations and compensating the positive charge deficiency. In all N -positions, H 3 O-groups replace large cations either partially or completely. Another specific feature of these samples is their low symmetry R 3, which is rare compared to R 3 m in eudialytes. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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