AM_Tetra-ferri-annite_4 Formula: Cs.89 Fe3.92 Si3.04 Al.04 O12 Name: Tetra-ferri-annite Unit cell: 5.476 9.502 10.954 90.0 99.54 90.0 , V=562.09 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 = 435 deg C, crystal 2