AM_Fluororichterite_2
Formula: Si8 Mg5 (Na2 Ca2) K4 O22 F2
Name: Fluororichterite
Unit cell: 10.008 18.087 5.278 90.0 106.69 90.0 , V=915.15
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 fluor-richterite 600C