AM_Zirkelite Formula: (Ca1.74 Th.26) Zr2 Ti2.11 Fe.91 Nb.98 O14 Name: Zirkelite Unit cell: 12.431 7.224 11.483 90.0 100.33 90.0 , V=1014.48 Space group: C12/C1 (15)

Sinclair W , Eggleton R A , American Mineralogist , 67 (1982) p.615-620, Structure refinement of zirkelite from Kaiserstuhl, West Germany