• Main Authors: Io Short, Communicat Ions
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Dane; Greenland; Ilimaussaq; Petersen
• 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

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 frame-work cations (Dane, 1966). This note gives the results of a thermal expansion study of a red tugtupite from Kvanefjeld, Ilimaussaq, Greenland, kindly supplied by Professor H. Serensen and O. V. Petersen, University of Copenhagen. The experimental procedure has been described previously (Henderson and Taylor, I975). Cell parameters, using the platinum plate as internal standard, were calculated by the method of least squares from more than 14 diffraction peaks, generally 18, which were indexed by reference to Dane (I966). The cell parameters, volumes, and c/a ratios are given for room temperature and elevated temperatures in Table I. When plotted these data yield smooth expansion curves without dis-T A B L E I. Cellparameters, volume.L and c/a ratios for tugtupite at room temperature and elevated temperatures