AM_Richterite_35 Formula: O24 Si7.44 Al.32 Ti.84 Fe Mg3.4 Ca.9 Na1.22 K1.29 H1.2 Name: Richterite Unit cell: 10.022 18.075 5.3 90.0 104.77 90.0 , V=928.36 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 24