AM_Tugtupite_4 Formula: Al Be Si4 O12 Na4 Cl Name: Tugtupite Unit cell: 8.63812 8.63812 8.8644 90.0 90.0 90.0 , V=661.44 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 = 210 C