AM_Frankamenite Formula: K2.87 Na3.14 Ca4.86 Si12 O32.78 F2 H4 Name: Frankamenite Unit cell: 10.094 12.691 7.24 90.0 111.02 110.2 , V=804.34 Space group: P1 (1)

Rozhdestvenskaya I V , Nikishova L V , Lazebnik K A , Mineralogical Magazine , 60 (1996) p.897-905, The crystal structure of frankamenite, Locality: South Yukutia, Russia