AM_Richterite_65 Formula: Na1.45 K.35 Mg3.97 Fe.2 Al.12 Mn.95 Ca.92 Si7.94 H1.65 O23.65 F.35 Name: Richterite Unit cell: 9.966 18.066 5.279 90.0 104.4 90.0 , V=920.60 Space group: C12/M1 (12)

Oberti R , Hawthorne F C , Ungaretti L , Cannillo E , European Journal of Mineralogy , 5 (1993) p.43-51, The behaviour of Mn in amphiboles: Mn in richerite, Sample: MR(4)