AM_Tetraferriannite_3 Formula: Cs.89 Fe3.92 Si3.04 Al.04 O12 Name: Tetraferriannite Unit cell: 5.48 9.5 10.907 90.0 99.6 90.0 , V=559.87 Space group: C12/M1 (12)

Comodi P , Zanazzi P F , Weiss Z , Rieder M , Drabek M , American Mineralogist , 84 (1999) p.325-332, Cs-tetra-ferri-annite: High-pressure and high-temperature behavior of a, potential nuclear waste disposal phase, T = 296 deg C, crystal 2