AM_Richterite_64 Formula: Na1.5 K.24 Mg4.28 Fe.24 Al.2 Mn.75 Ca.88 Si7.84 H1.7 O23.7 F.3 Name: Richterite Unit cell: 9.909 18.03 5.278 90.0 104.23 90.0 , V=914.03 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(3)