AM_Richterite_38 Formula: O24 Si7.6 Al.16 Ti.59 Fe Mg3.65 Ca.92 Na1.2 K1.32 H2 Name: Richterite Unit cell: 10.041 18.081 5.3 90.0 104.79 90.0 , V=930.34 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 27