AM_Fluororichterite Formula: Si8 Mg5 (Na2 Ca2) K4 O22 F2 Name: Fluororichterite Unit cell: 9.938 17.952 5.258 90.0 106.62 90.0 , V=898.87 Space group: I12/M1 (12)

Cameron M , Sueno S , Papike J J , Prewitt C T , American Mineralogist , 68 (1983) p.924-943, High temperature crystal chemistry of K and Na fluor-richterites, Na, 24 deg C