AM_Tugtupite_9 Formula: Al Be Si4 O12 Na4 Cl Name: Tugtupite Unit cell: 8.67908 8.67908 8.895 90.0 90.0 90.0 , V=670.03 Space group: I1-41 (1)

Antao S M , Hassan I , Parise J B , American Mineralogist , 89 (2004) p.492-497, Tugtupite: High-temperature structures obtained from in situ synchrotron, diffraction and Rietveld refinements, T = 644 C