The thermal expansion of tugtupite TUGTUPITE (Dane, 1966; Sorensen, Dane, and Petersen, I971) has a distorted sodalite type of structure, tetragonal with space group I7r and has almost the ideal composition Nas (A12Be2SisO2~)C1 ~. The reduction from cubic symmetry results from the ordering of the fr...
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.626.9624 http://www.minersoc.org/pages/Archive-MM/Volume_41/41-317-130.pdf |