AM_Arfvedsonite_2 Formula: Si7.84 Al.306 Fe4.52 Ti.094 Mn.13 Mg.11 Na2.428 Ca.158 K1.414 O24 H2 Name: Arfvedsonite Unit cell: 10.007 18.077 5.332 90.0 104.101 90.0 , V=935.48 Space group: C12/M1 (12)

Hawthorne F C , The Canadian Mineralogist , 14 (1976) p.346-356, The crystal chemistry of the amphiboles: V. The structure and, chemistry of arfvedsonite