AM_Zirkelite_1 Formula: Ca.84 Na.31 Th.265 Ce.595 Zr2 (Ti2.16 Nb.524 Ta.316) Fe O14 Name: Zirkelite Unit cell: 7.287 7.287 16.886 90.0 90.0 120.0 , V=776.52 Space group: P3121 (152)

Mazzi F , Munno R , American Mineralogist , 68 (1983) p.262-276, Calciobetafite (new mineral of the pyrochlore group) and related minerals from