Formula: Ca5.22 Mn.6 Y.18 Ce.192 Nd.036 La.018 Fe2.61 Si25.918 Nb.128 Na14.28 Sr.06 K.3 Zr2.85 Ti.09 O74.94 (Cl1.6 H.4)
Name: Eudialyte
Unit cell: 14.2257 14.2257 30.006 90.0 90.0 120.0 , V=5258.79
Space group: R-3M (166)

Johnsen O , Grice J D , The Canadian Mineralogist , 37 (1999) p.865-891, The crystal chemistry of the eudialyte group, Loclaity: Narssarssuk pegmatite, South Greenland, Sample: #14, Note: additional sites with low but unreported occupancies excluded