AM_Agrellite Formula: (Ca1.905 Eu.095) Na Si4 F O10 Name: Agrellite Unit cell: 7.759 18.946 6.986 89.88 116.65 94.32 , V=914.67 Space group: P-1 (2)

Ghose S , Wan C , American Mineralogist , 64 (1979) p.563-572, Agrellite, Na(Ca,RE)2Si4O10F: A layer structure with silicate tubes