AM_Pargasite_5 Formula: (Si6.2 Al1.8) Mg3.343 Fe1.771 Ca1.702 Na3.384 O24 H2 Name: Pargasite Unit cell: 9.805 17.96 5.302 90.0 104.93 90.0 , V=902.15 Space group: C12/M1 (12)

Makino K , Tomita K , American Mineralogist , 74 (1989) p.1097-1105, Cation distribution in the octahedral sites of hornblendes, sample I-P from Iratsu, Japan