AM_Hastingsite_1 Formula: K.685 Na.255 Ca1.992 (Fe3.771 Mg1.229) Al2.4 Si5.6 O23.1 Cl.9 H1.1 Name: Hastingsite Unit cell: 9.962 18.283 5.372 90.0 104.87 90.0 , V=945.66 Space group: C12/M1 (12)

Makino K , Tomita K , Suwa K , Mineralogical Magazine , 57 (1993) p.677-685, Effect of chlorine on the crystal structure of a chlorine-rich hastingsite, Locality: West Ongul, East Antarctica