AM_Richterite_43 Formula: O24 Si7.68 Al.16 Ti.36 Fe Mg3.8 Ca.94 Na1.15 K1.3 H2 Name: Richterite Unit cell: 10.051 18.068 5.295 90.0 104.79 90.0 , V=929.72 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 32