AM_Richterite_39 Formula: O24 Si7.68 Al.16 Ti.41 Fe.9 Mg3.85 Ca Na1.12 K1.26 H2 Name: Richterite Unit cell: 10.046 18.065 5.297 90.0 104.82 90.0 , V=929.33 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 28