AM_Cummingtonite_4
Formula: Fe2.473 Mg4.423 Al.014 Ca.1 Si8 O24
Name: Cummingtonite
Unit cell: 9.5057 18.1187 5.3059 90.0 102.031 90.0 , V=893.77
Space group: P121/M1 (11)

Yang H , Hirschmann M M , American Mineralogist , 80 (1995) p.916-922