AM_Astrophyllite_7 Formula: K1.96 Ba.01 Na1.65 Ca.14 Fe3.2 Mn.75 Mg2.05 (Ti1.97 Nb.03) Si8 O30 H4 F.17 Name: Astrophyllite Unit cell: 5.3327 23.1535 10.3775 90.0 99.615 90.0 , V=1263.32 Space group: C12/M1 (12)

Sokolova E , Camara F , European Journal of Mineralogy , 20 (2008) p.253-260, Re-investigation of the crystal structure of magnesium astrophyllite, Locality: Mt. Yukspor, Khibina alkaline massif, Kola Peninsula, Russia