AM_Hellandite-(Ce) Formula: B4 Si4 (Al.83 Fe.65 Ti.41 Mg.11) (Ca4.2 Th.36 U.06 Y.12 La.3 Ce.66 Pr.06 Nd.24) Be.74 Li.24 H.5 O23.5 F.5 Name: Hellandite-(Ce) Unit cell: 19.068 4.745 10.289 90.0 111.18 90.0 , V=868.04 Space group: P12/A1 (13)

Oberti R , Ottolini L , Camara F , Della Ventura G , American Mineralogist , 84 (1999) p.913-921, Crystal structure of non-metamict Th-rich hellandite-(Ce) from Latium (Italy), and crystal chemistry of the hellandite-group minerals