AM_Richterite_40 Formula: O24 Si7.52 Al.24 Ti.69 Fe5 Mg4.05 Ca Na1.09 K1.29 H2 Name: Richterite Unit cell: 10.039 18.068 5.298 90.0 104.81 90.0 , V=929.05 Space group: C12/M1 (12)

Oberti R , Vannucci R , Zanetti A , Tiepolo M , Brumm R C , American Mineralogist , 85 (2000) p.407-419, A Crystal Chemical re-evaluation of amphibole/melt and amphibole/clinopyroxene, DTi values in petrogenetic studies, SAMPLE 29