AM_Richterite_63 Formula: Na1.62 K.2 Mg4.28 Fe.24 Al.14 Mn.81 Ca.75 Si7.9 H1.66 O23.66 F.34 Name: Richterite Unit cell: 9.892 18.027 5.278 90.0 104.09 90.0 , V=912.87 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(2)