AM_Semenovite-(Ce) Formula: Ce Na3.4 Fe.25 Mn.25 Ca1.3 Si7 Be3 O22 F2 H2 Name: Semenovite-(Ce) Unit cell: 13.879 13.835 9.942 90.0 90.0 90.0 , V=1909.02 Space group: PMNN (58)

Mazzi F , Ungaretti L , Dal Negro A , Petersen O V , Ronsbo J G , American Mineralogist , 64 (1979) p.202-210, The crystal structure of semenovite